JP2009059454A - Data recording apparatus, data recording method, and computer program - Google Patents

Abstract

Data is suitably recorded on a recording medium a plurality of times in a format conforming to UDF (registered trademark) defined by OSTA.
At the time of each additional recording, AVDP writing is sequentially performed at two locations of the last logical sector number N and the logical sector number before 256 sectors from N, so that a conventional data reproduction dedicated device is connected. Ensure compatibility. Also, in preparation for the risk of AVDP recording failure due to power interruption of the recording device or other unforeseen circumstances while recording user data on the disc, the AVDP generated at every additional recording is backed up sequentially. Therefore, the second reserved area is used.
[Selection] Figure 1

Description

  The present invention relates to a data recording apparatus and a data recording method for recording data on a recording medium, and a computer program. For example, data is additionally recorded on an optical disc that can be recorded only once, such as DVD-R, DVD + R, and CD-R. The present invention relates to a data recording apparatus, a data recording method, and a computer program.

  More specifically, the present invention relates to a data recording apparatus and a data recording method for additionally recording data on a recording medium a plurality of times in a format conforming to UDF (Universal Disk Format) (registered trademark) defined by OSTA (Optical Storage Technology). In particular, the present invention relates to a data recording apparatus and data recording method for performing additional recording a plurality of times on a write-once type recording medium in a state where it can be reproduced by a reproduction-only apparatus, and a computer program.

  Disc-type recording media (hereinafter referred to as “optical discs”) such as DVDs (Digital Versatile Disks) and CDs (Compact Discs) are rapidly spreading as storage for computer files and video streams. Have been doing. Optical disks have a large storage capacity and can be accessed randomly. Also, unlike a contact-type magnetic recording medium, there is no concern about wear or damage to the recording surface or head crash due to reading. Also, the disk surface is sturdy and the risk of accidental data loss is low. In recent years, recording / reproducing apparatuses using write-once optical disks such as DVD-R, DVD + R, and CD-R have been developed and manufactured, and are used as, for example, external recording media for computers and external storage devices.

  For example, UDF (Universal Disk Format) (registered trademark) formulated by OSTA (Optical Storage Technology Association) is known as a highly compatible optical disc format (for example, see Non-Patent Document 1). UDF corresponds to an implementation technology of ISO / IEC 13346 standard also known as ECMA (European Computer Manufacturers Association) -167 (see, for example, Non-Patent Document 2) (ISO / IEC 13346 is a disk capacity or file format). It is the successor to ISO 9660 corresponding to the increase in the number of scales). In the 1990s, coupled with the low prices of CD-RW media and CD recording devices, UDF became widespread as a writable optical disc application.

  In UDF, by adopting a packet writing method, processing such as addition or deletion of a file on an optical disc can be performed through a normal file system. The packet writing method here refers to a packet structure in which a link block and four Run-In areas are provided in front of user data, and two Run-Out areas are provided at the end of user data. To do. That is, in addition to the user data area, one packet is used as a link area (Linking Area) in which 7 blocks are junction areas between adjacent packets. UDF is writable by almost any operating system (OS), and the written file is a file system that is compatible with playback on the OS without a special reading program. The content in the optical disc can be manipulated in the same manner as a trademark (trademark) disc and a USB (Universal Serial Bus) flash memory. However, in the case of write-once recording media such as DVD-R, DVR + R, and CD-R, the deleted file only logically disappears from the directory, and the physical substance of the data is physically stored in the recording media. It remains.

  In the case of a write-once disc such as a DVD-R or CD-R, writing to a physical sector can be performed only once, and data must be written incrementally toward the outer circumference without placing an empty logical sector. There is a restriction that it must not. This means that in the original UDF format, after pre-mastering the data, all the data must be written together on the media (similar to writing on CD media with ISO 9660).

  Therefore, in order to be able to virtually modify files on CD-R and DVD-R in the same way as hard disks, OSTA has set up a Virtual Allocation Table (hereinafter referred to as “VAT”) for the UDF standard. And a method of recording using the Virtual Partition Map. The VAT is an additional data structure on the disk including a logical address where a file is actually recorded and a table for managing a virtual address corresponding to the logical address. When a file or other data on the disk is changed, the logical addresses can be rearranged using VAT, and the media on which sequential writing is performed can be handled as if it were a random readable / writable media. . In this case, it is possible to perform additional recording on a recording medium that can be recorded only once, such as DVD-R, DVD + R, and CD-R, by installing VAT in the disk recording device.

  Here, in consideration of the convenience of the user, the recording medium additionally recorded according to the UDF is not yet subjected to special processing such as finalization, that is, in a state where it can still be additionally recorded, even in a playback-only device. Preferably it can be regenerated. For example, a disc such as a still image or a moving image taken with a digital camera and recorded on a DVD is taken out, loaded into a DVD player, displayed and output, and loaded again into the digital camera to record additional shot images. The user wants to use it.

  By using the VAT described above, such a flexible disk utilization method is possible. However, since many of the disk read-only apparatuses that are already widely used do not implement VAT, the disk recording apparatus cannot ensure compatibility with these existing disk read-only apparatuses. For example, there is a report from a user that a moving image DVD burned on a personal computer could not be reproduced by a set-top DVD player. The cause depends on whether the UDF format conforming to each device is compatible with VAT. Although it is conceivable to install VAT in a dedicated disk playback device that will be on the market in the future, there is a problem that the cost of the device increases.

  In UDF, file system data includes VDS (Volume Descriptor Sequence), which is a descriptor describing information about the contents of the volume structure, and is one of the restrictions / requirements for writing each data field. AVDP as pointer information for the VDS is the 256th logical sector number (1st AVDP), the last logical sector number N (3rd AVDP) that has been recorded, and the logical sector number (2nd AVDP) just before 256 sectors from N ) To record AVDP in at least two places. If AVDP is recorded in two or more locations, even if a defect occurs in the disc and some AVDP cannot be read, the same information can be read from other recording locations.

  In order to use the disc alternately between the disc recording device and the disc playback-dedicated device before finalization, that is, in a state where additional recording is possible without using VAT, the disc recording device records data or performs additional recording. It is desirable that the disc ejected after this conforms to the UDF format. In other words, it is necessary to record AVDP in at least two of the three prescribed points on the disc.

  Since the recording location of the AVDP is determined on the side of the disc playback device that has received the disc from the disc recording device, an AVDP (Anchor Volume Descriptor) → VDS (LVD (Logical Volume Descriptor)) → MD (Meta Data) file FE (File Entry)-> FSD (File Set Descriptor)-> root directory ICB (Information Control Block)-> FID (File Identifier Descriptor) in the root directory-> IC file search by file " The file data can be read using the search result. That is, the AVDP is a point that the host reads first, and can reach all files on the optical disk starting from the location (see, for example, Patent Document 1). For example, a recording apparatus that quickly caches file management data such as AVDP when a disk is mounted has been proposed (see, for example, Patent Document 2).

  Here, one of the two locations where the AVDP is recorded is the 256th logical sector number (1st AVDP), and the other is the last logical sector number N (3rd AVDP) that has been recorded and the logical sector that is 256 sectors before N. If the sector number (2nd AVDP) is used, resistance to defects is enhanced by recording two AVDPs apart from each other. However, due to the restriction that the write-once disc must write data continuously toward the outer periphery without placing an empty logical sector, when the AVDP (1st AVDP) is once recorded in the 256th logical sector number The AVDP of the disc is determined, and thereafter, additional recording on the disc becomes impossible regardless of whether an unused area remains. That is, when the disc recording device records the 1st AVDP when the disc is ejected, the AVDP can be maintained, but the additional recording is repeated a plurality of times while alternately switching the write-once disc between the disc recording device and the disc reproduction dedicated device. This type of usage is not allowed.

  Also, when user data is recorded on the disc, if the AVDP recording fails due to the power interruption of the recording device or other unforeseen circumstances, the file system data is not recorded even if the data itself can be recorded successfully. Since the analysis becomes impossible, the disk itself becomes unusable after that. Further, in order to make such a disc reanalysable, it is necessary to search the AVDP from the sector of the last logical sector number N that has been recorded toward the sector on the inner circumference side, and processing takes time. Cost.

JP 2006-172528 A, paragraph 0010 JP 2004-145411 A http: // www. osta. org / specs / index. htm http: // www. ecma-international. org / publications / standards / Ecma-167. htm

  An object of the present invention is to provide an excellent data recording apparatus, data recording method, and computer that can suitably perform additional recording of data on a recording medium in a format conforming to UDF (registered trademark) defined by OSTA multiple times. To provide a program.

  A further object of the present invention is to provide an excellent data recording apparatus capable of performing additional recording a plurality of times on a write-once recording medium while ensuring compatibility with a read-only apparatus not equipped with VAT. And a data recording method and a computer program.

  A further object of the present invention is to record AVDP as pointer information for the VDS describing the volume structure in a specified location without using VAT, and to suitably perform additional recording on a write-once recording medium. An object is to provide an excellent data recording apparatus and data recording method, and a computer program.

  A further object of the present invention is to provide an excellent data recording apparatus and data capable of recovering a recording medium to a reanalyzable state in a short time even if AVDP recording fails during additional recording. To provide a recording method and a computer program.

The present invention has been made in consideration of the above problems, and a first aspect of the present invention is a data recording apparatus for performing additional recording on a disk composed of a plurality of logical sectors in accordance with a predetermined file system format. In the predetermined file system format, at least two of the first logical sector on the inner circumference side of the disk and the second and third logical sectors on the inner circumference side from the last recorded logical sector are recorded. It is decided to record reference information for file system data in
The standard information is recorded at a predetermined logical sector position from the innermost circumference of the disk, the first reserved area including the first logical sector is reserved immediately after the recording of the standard information, and the first Disk initialization means for reserving the second reserved area immediately after the reserved area and immediately before the fourth logical sector serving as the file / data recording start position, and for initializing the disk;
A fourth logical sector immediately after the second reserved area (in the case of a disk in which file data has not been recorded immediately after initialization), or a continuous file from the logical sector immediately after the recorded area Data recording means for recording data and file system data, and for recording reference information for file system data in two locations of the second and third logical sectors on the inner circumference side from the last logical sector that has been recorded When,
Reference information backup means for recording a backup of reference information from the innermost circumference of the unused area in the second reserved area to the file system data recorded by the data recording means;
A data recording apparatus comprising:

  The present invention relates to a data recording apparatus for performing additional recording of data on a recording medium such as an optical disc a plurality of times based on, for example, a file system conforming to UDF defined by OSTA.

  Here, in consideration of the convenience of the user, the recording medium additionally recorded according to the UDF is not yet subjected to special processing such as finalization, that is, in a state where it can still be additionally recorded, even in a playback-only device. Preferably it can be regenerated. However, since many of the disk read-only apparatuses that are already widely used do not implement VAT, the additional recording method using VAT is not necessarily preferable from the viewpoint of compatibility with the disk read-only apparatus.

  In UDF, as one of the restrictions / requirements regarding writing of each data field, AVDP as pointer information for the VDS describing the volume structure is the 256th logical sector number and the last logical that has been recorded. It has been decided that AVDP is recorded in at least two locations of the sector numbers N and N that are 256 sectors before the sector number N.

  When VAT is not used, it is necessary to record AVDP in at least two of the three prescribed locations each time user data is recorded or additionally recorded on the disc. From the viewpoint of data integrity, it is preferable to record AVDP (1st AVDP) in the 256th logical sector number. However, in the write-once disc, there is a problem that 1st AVDP cannot be recorded in order to keep the disc in a state where additional recording can be performed due to the restriction that data must be continuously written toward the outer periphery without placing an empty logical sector. There is.

  Also, when user data is recorded on the disc, if the AVDP recording fails due to the power interruption of the recording device or other unforeseen circumstances, the file system data is not recorded even if the data itself can be recorded successfully. Since the analysis becomes impossible, there is also a problem that the disk itself becomes unusable thereafter.

  On the other hand, according to the data recording apparatus of the present invention, the disk initialization means reserves the area including the 256th logical sector as the first reserved area during the disk initialization process. Yes. The first reserved area is an area reserved for finally writing predetermined file system data whose contents are determined at the stage of finishing additional recording to the disc when performing special processing such as finalization. Therefore, after the final AVDP (1st AVDP) can be written in the 256th logical sector, data recording is performed from this reserved area. The reserved area is kept in a reserved state until an explicit instruction is given by special processing such as finalization.

  When data recording or additional recording is performed on the disc after initialization, the data recording means starts packet writing from a logical sector immediately after the recorded area (including the reserved area). In the packet structure, user data is written from the inner logical sector toward the outer periphery, and then file system data is written without leaving an unrecorded area immediately thereafter.

  The file system data includes a VDS (Volume Descriptor Sequence) that is a descriptor describing information about the contents of the volume structure, and this VDS is indicated by an AVDP (Anchor Volume Descriptor Pointer). In UDF, VDS is allowed to be freely arranged in the packet structure, but restrictions and essential conditions are imposed on the position of AVDP. Therefore, when the data recording means performs recording or additional recording on the disk, the data recording means performs recording at the two locations of the second and third logical sectors on the inner circumference side from the last logical sector that has been recorded (that is, The AVDP is recorded in the logical sector numbers N and 2 at the location of 256 sectors before the logical sector number N).

  Since the disc at this point conforms to the UDF format, it can be taken out from the data recording device and can be played back by another disc playback dedicated device. In addition, the disc can be loaded again into the recording apparatus, and thereafter, additional recording can be performed in a format conforming to UDF. Until special processing such as finalization is performed, unless the upper limit of the recording capacity is reached, additional packet recording can be performed a plurality of times by sequentially performing similar packet writing.

  According to the data recording apparatus of the present invention, in the disk initialization process, the area from the disk initialization means immediately after the first reserved area to immediately before the fourth logical sector serving as the file / data recording start position Are reserved as a second reserved area. The second reserved area is an area reserved for sequentially backing up AVDP generated every time additional recording is performed.

  The data recording means starts packet writing from the logical sector immediately after the recorded area (including the reserved area) when performing data recording or additional recording on the disc after initialization. User data is written from the logical sector toward the outer periphery, and the AVDP is recorded in two locations of the second and third logical sectors on the inner periphery side from the last recorded logical sector. The means records the AVDP as a backup from the innermost circumference (Next Writable Area) of the unused area in the second reserved area. Therefore, the latest AVDP backup is always secured for the logical sector number having the largest value in the second reserved area.

  When the data recording means fails to write data to the disk due to the power-off of the recording device or other unforeseen circumstances, the disk has the second and second inner circumferential sides from the last recorded logical sector. Thus, AVDP is not recorded in two locations of the logical sector 3 (that is, the last logical sector number N in the recorded area and the two logical sector numbers before 256 sectors from N).

  Therefore, when the disc is newly loaded, the disc recognition unit reads the AVDP from the second and third logical sectors on the inner circumference side from the last logical sector on which the disc has been recorded, The disk can be recognized through accessing and analyzing system data. When analysis of the file system data fails, such as when AVDP cannot be read, the restoration means reads AVDP backed up in the logical sector having the largest value in the second reserved area, and has recorded this Recorded in two locations of the second and third logical sectors on the inner circumference side from the last logical sector (that is, the last logical sector number N in the recorded area and two locations in the logical sector number just before 256 sectors) By doing so, it is possible to restore the disc to a state where it can be additionally recorded by the data recording means.

  Thereafter, when an explicit instruction is given by special processing such as finalization, the finalization processing means records the AVDP in the 256th logical sector serving as the first reserved area and also uses the first reserved area. In addition, the surplus area of the second reserved area is padded. In this manner, AVDP (1st AVDP) can be recorded in the 256th logical sector that is hardly damaged in the end. Further, by arranging the AVDP in the 256th logical sector, it is possible to ensure wide compatibility with the conventional disc reproduction dedicated device.

According to a second aspect of the present invention, in a computer-readable format, a process for performing additional recording on a disk composed of a plurality of logical sectors is executed on a computer according to a predetermined file system format. A written computer program comprising:
In the predetermined file system format, at least two of the first logical sector on the inner circumference side of the disk and the second logical sector on the inner circumference side from the last logical sector on which recording has been performed are placed in the file system. It is decided to record reference information for the data,
For the computer
The standard information is recorded at a predetermined logical sector position from the innermost circumference of the disk, the first reserved area including the first logical sector is reserved immediately after the recording of the standard information, and the first A disk initialization procedure for reserving the second reserved area from immediately after the reserved area to immediately before the fourth logical sector as the file / data recording start position, and for initializing the disk;
A fourth logical sector immediately after the second reserved area (in the case of a disk in which file data has not been recorded immediately after initialization), or a continuous file from the logical sector immediately after the recorded area Data recording procedure for recording data and file system data, and recording reference information for the file system data in the second and third logical sectors on the inner circumference side from the last logical sector that has been recorded When,
A reference information backup procedure for recording a backup of reference information from the innermost circumference of the unused area in the second reserved area to the file system data recorded by the data recording means;
Disc recognition procedure for recognizing a disc by analyzing file system data at two locations of the second and third logical sectors on the inner circumference side from the last logical sector on which a newly loaded disc has been recorded When,
When the disk cannot be recognized by executing the disk recognition procedure, the reference information to the file system data backed up in the logical sector having the largest value in the second reserved area is read, A repair procedure for recording the reference information in two locations of the second and third logical sectors on the inner circumference side from the last recorded logical sector and repairing the disc to a state in which additional recording is possible; ,
When the additional recording to the disk is finished, padding is performed from the inner circumference side of the reserved area to immediately before the first logical sector with dummy data, and a reference to the file system data recorded last is added A finalizing process procedure in which information recording is started from the first logical sector, and an area from immediately after the recording of the reference information to immediately before the fourth logical sector is padded with dummy data;
Is a computer program characterized in that

  The computer program according to the second aspect of the present invention defines a computer program described in a computer-readable format so as to realize predetermined processing on the computer. In other words, by installing the computer program according to the second aspect of the present invention in the computer, a cooperative action is exhibited on the computer, and the same as the data recording apparatus according to the first aspect of the present invention. An effect can be obtained.

  According to the present invention, an excellent data recording apparatus and data recording method capable of suitably performing additional recording on a recording medium a plurality of times in a format conforming to UDF (registered trademark) defined by OSTA, and a computer A program can be provided.

  Further, according to the present invention, without using VAT, AVDP as pointer information for the VDS describing the volume structure is recorded at a prescribed location, and additional recording onto a write-once recording medium is suitably performed. It is possible to provide an excellent data recording apparatus, data recording method, and computer program.

  In addition, according to the present invention, an excellent data recording apparatus capable of recovering a recording medium to a reanalyzable state in a short time process even if AVDP recording fails during additional recording, and A data recording method and a computer program can be provided.

  Other objects, features, and advantages of the present invention will become apparent from more detailed description based on embodiments of the present invention described later and the accompanying drawings.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Device configuration:
The data recording apparatus according to the present invention adds data to a recording medium such as an optical disc that can be recorded only once, such as DVD-R, DVD + R, and CD-R, based on a file system conforming to UDF defined by OSTA. Make a record. One typical apparatus configuration example is a digital camera that digitizes an image captured by a solid-state imaging device.

  FIG. 1 schematically shows a hardware configuration of a digital camera 10 according to an embodiment of the present invention.

  A camera block 1 that captures a subject includes a lens that captures the subject image, a solid-state imaging such as a CCD (Charge Coupled Device) or a CMOS (Complementary Mental-Oxide Semiconductor) that generates an electrical image signal by photoelectric conversion according to the amount of input light. It comprises an element, an A / D converter that digitally converts an image signal, a demosaic processing unit that calculates an RGB signal from the digital image signal, and the like (not shown).

  The image signal calculation processing unit 2 performs color reference form conversion from RGB signals to color differences and luminance signals, and encoding / compression processing to JPEG or MPEG format. Further, the image signal calculation processing unit 2 supplies the processed image signal to the display unit 7 configured by a liquid crystal display (LCD) or the like, and outputs an image.

  The recording unit 4 receives the image file encoded and compressed by the image signal arithmetic processing unit 2 via the data buffer 3 and records it on the recording medium 4-1 being loaded such as an optical disk. In the present embodiment, data is additionally recorded on a recording medium a plurality of times based on a file system conforming to UDF defined by OSTA. Details of this point will be described later.

  The central processing unit 5 is provided by an operating system (OS) while loading an execution program into a temporary storage medium 6 constituted by a RAM (Random Access Memory) and temporarily storing system variables and environment variables. The overall processing operation of the digital camera 10 is comprehensively controlled in the form of executing the program under the execution environment. Processing operations referred to herein include camera image capturing in the camera block 1 and accompanying auto-focus function, automatic exposure, camera shake correction, auto shutter, and recording medium 4-1 in the recording unit 4. For example, data recording.

  FIG. 2 shows an internal hardware configuration of the recording unit 4.

  The OP (Optical Pickup) unit 13 includes an objective lens, a laser diode (LD), a laser diode driver (LDdrv), a photodetect IC (Photo Detect IC), a half mirror, and the like. At the time of data reproduction, a reflected light signal from the recording surface of the optical disc 25 with respect to the irradiated laser light is detected and output to the RF processing unit 14. Further, at the time of data recording, data is written to the optical disc 25 based on a laser blinking / driving signal (DECEFMW) from the signal processing unit 17 necessary for pit formation, a write strategy signal indicating the optimum value of laser intensity and blinking, and the like. To do. The write strategy is a technique for correcting the laser pulse at the time of writing in the time direction and the level direction for each pit so that the pit size after writing satisfies the standard.

  The RF processing unit 14 samples and holds the eight signals including the beam signal, the side, and the main detected from the OP unit 13 and performs arithmetic processing, and the FE (from a predetermined signal among the eight signals is calculated. Signals such as focus error), TE (tracking error), MIRR (mirror), ATIP (Absolute Time In Pregroove), and a read main signal are generated. The RF processing unit 14 outputs FMDT (frequency modulation data), FMCK (frequency modulation clock), TE, and FE among the generated signals to the servo signal processing unit 15, and detects the optimum value of the laser intensity detected by trial writing ( An OPC (Optical Power Calibration) signal and a laser blinking / driving signal are output to the signal processing unit 17, and MIRR is output to the central processing unit 5.

  When the FMDT, FMCK, TE, and FE are input from the RF processing unit 14, the servo signal processing unit 15 generates various servo control signals peculiar to the optical disc according to instructions from the central processing unit 5, and sends them to the analog filter processing unit 16. Output.

  The analog filter processing unit 16 generates an analog signal based on various servo control signals from the servo signal processing unit 15 and outputs the analog signal to the spindle driver 18, thread driver 19, tracking driver 20, and focus driver 21. To do.

  The signal processing unit 17 receives the OPC and DECEFM from the RF processing unit 14 under the control of the central processing unit 5, and performs CIRC (Cross Interleaved Reed-Solomon Code) decoding and encoding, write strategy, ADDr decoding, asymmetry, and running. Processing such as OPC is performed. When data is written to the optical disc 25, signals such as a laser blinking / driving signal and a signal indicating the optimum value of the laser intensity are output to the OP unit 13.

  The spindle driver 18 controls the rotation of the spindle motor 22 based on the signal from the analog filter processing unit 16. The thread driver 19 controls the thread operation of the thread motor 23 based on the signal from the analog filter processing unit 16. The tracking driver 20 swings the OP unit 13 based on a signal from the analog filter processing unit 16 to control the position of the beam spot irradiated on the recording surface of the optical disc 25. The focus driver 21 controls the focus adjustment of the laser by moving the OP unit 13 in the direction perpendicular to the recording surface of the optical disc 25 based on the signal from the analog filter processing unit 16. The spindle motor 22 rotates the optical disc 25 based on a signal from the spindle driver 18. The thread motor 23 performs a thread operation of the OP unit 13 based on a signal from the thread driver 19.

  The central processing unit 5 uses the temporary storage medium 6 as a work memory (described above). For example, the central processing unit 5 stores file system data related to a UDF file system that is updated each time a file or directory is updated, added, or deleted. The data is stored until immediately before the main power of the device 1 is turned off.

  When reading data from the optical disc 25, the laser diode light reflected from the recording surface is read by the lens optical system of the OP section 13. Light from the lens optical system is converted into an electrical signal by the PDIC, sampled and held in the RF processing unit 14, and signals such as FE, TE, MIRR, ATIP, and readout main signal are calculated from each of the eight predetermined signals. Generated by processing.

  First, the FE obtained by the RF processing unit 14 is adjusted in characteristics by the servo signal processing unit 15 and then input to the focus driver 21 through the analog filter processing unit 16. The focus driver 21 moves the lens drive focus coil (not shown) of the OP unit 13 in the vertical direction to correct the focus shift.

  The TE obtained by the RF processing unit 14 is input to the tracking driver 20 through the analog filter processing unit 16 after the AC signal is extracted by the servo signal processing unit 15 and subjected to digital filter processing. The The tracking driver 20 finely moves the lens drive tracking coil of the OP unit 13 in the radial direction to correct tracking deviation.

  The TE obtained by the RF processing unit 14 is input to the thread driver 19 through the analog filter processing unit 16 after the DC component is extracted by the servo signal processing unit 15 and subjected to digital filter processing. The The thread driver 19 operates the thread motor, moves the entire OP unit 13 in the radial direction of the recording medium, and corrects the deviation of the thread operation. During the seek operation, the thread motor is forcibly driven by intentionally applying the thread control voltage from the outside.

  In this way, a tracking operation is performed in which only the lens is finely moved in the radial direction based on the AC component of TE, and a thread operation is performed to move the entire OP unit 13 in the radial direction based on the DC component.

  Since the detection signal (mirror) of the change in reflectance of the recording medium output from the RF processing unit 14 is detected when the OP unit 13 crosses the track, the current seek position and reading position are counted by counting the mirrors. Detection, and start and stop of the optical pickup operation.

  The spindle motor 22 is controlled based on ATIP processing. Time information is recorded in a meandering groove called a wobble groove written on the optical disc 25 by FM modulation of +/− 1 KHz with a center frequency of 22.05 KHz in the radial direction. What is modulated is time information referred to as Bi-Phase modulated ATIP.

  When the focus and the tracking are matched, the RF processing unit 14 extracts a wobble signal from a predetermined combination of the eight input signals. FM demodulation and ATIP decoding are performed and taken out as FMCK and FMDT. The FMDT is stored in a predetermined register classified as an absolute time position of the optical disc 25, that is, an address and other additional information by the servo signal processing unit 15, and data is read out accordingly.

  The RF processing unit 14 extracts a signal corresponding to the recording pit from a predetermined combination of 8 signals, equalizes the signal, and then supplies the signal processing unit 17 with the EFM (Eight to Fourteen Modulation) signal format. The signal processing unit 17 can perform decoding based on CIRC to obtain desired data.

  When writing data to the optical disc 25, first the ATIP information is read by moving the pickup to the lead-in area. Further, the special information portion is read out from the information to know the start position of the lead-in area. The start position is normally stored as time information. The information written in the special information corresponds to the individual identification code of the optical disc 25. In the device 1, a write strategy parameter corresponding to this individual identification code and other related parameters are stored in advance as a table. This correction parameter is prepared for each recording medium in advance.

  Next, an OPC (Optical Power Calibration) operation for determining an optimum value of the laser output is performed. While the above-described write strategy is detailed control of the laser for each write pit, OPC is an operation for calculating the overall optimum value. By performing OPC, a write set value corresponding to an ideal read target value is obtained.

  Data is written by performing a CIRC or EFM encoding process on the compressed captured image data prepared in the data buffer 3, and then a laser blinking / driving signal and a write strategy signal necessary for pit formation. Is input to the laser driver of the OP unit 13. At this time, writing is performed at a predetermined position along the file system with reference to an address in frame units obtained from the FMDT signal obtained by decoding ATIP. In the first writing, the writing is started from a position where an area of about 20 megabytes which becomes a lead-in area in a subsequent close session is skipped.

Additional recording operations on optical discs:
In the data recording apparatus 1 according to the present embodiment, data recording is performed on the optical disc 25 based on a file system conforming to UDF defined by OSTA, but recording that can be recorded only once, such as DVD-R and CD-R. It is characterized in that additional recording is performed a plurality of times while ensuring compatibility with a disk playback dedicated device.

  In OSTA, files on a CD-R or DVD-R can be virtually modified in the same way as a hard disk, and recorded using the Virtual Allocation Table and the Virtual Partition Map against the UDF standard. The technique to be added is added. However, since many disc playback-only devices do not incorporate VAT technology, when additional recording is performed on a disc using VAT, the disc-playback-only device is not ready for playback, and compatibility is lost. Therefore, the data recording apparatus 1 according to the present embodiment performs additional recording on the optical disk without using VAT, so that the optical disk can always be played back by a dedicated disk playback apparatus (that is, many conventional disk playback only). Maintain compatibility with the device).

  As described above, the packet writing method is adopted in UDF, and a link block and four Run-In areas are provided in front of user data, and two Run-Out areas are provided at the end of user data. The data is written as a packet having a volume structure. That is, in addition to the user data area, 7 blocks are used as a link area (Linking Area) that is a joint area between adjacent packets. In the case of a medium that can be recorded only once, such as a DVD-R or a CD-R, data must be written continuously toward the outer periphery without placing unwritten logical sectors.

  FIG. 3 shows a data layout immediately after the initialization process is performed on the optical disc.

  After padding the 15th logical sector (Logical Sector Number: LSN) from the innermost periphery to the outer periphery with NULL data, standard information called VRS (Volume Recognition Sequence) is written from the 16th logical sector. It is. The VRS is composed of one or a plurality of volume structure descriptors (Volume Structure Descriptors) describing information such as type, identifier, and version information related to the volume structure. The content of the VRS itself is not directly related to the gist of the present invention and will not be further described here.

  The first reserved area is provided in the area from the end of VRS writing to the 511st logical sector, and the second reserved area is provided in the 512th to 1023rd logical sector areas. . The area reservation is performed by using, for example, a RESERVE TRACK (track reservation) command defined in SCSI (Small Computer System Interface) -3 Multimedia Commands.

  The unrecorded area after the 1024th logical sector is a partition, that is, a space for recording a file of user data and file system data related to the file, and its configuration is defined in the VDS ( Later). In the partition, file data and related file system data can be recorded according to the UDF file system by a packet writing method.

  The first reserved area is an area reserved for finally writing predetermined file system data whose contents are determined at the stage of finishing additional recording to the disc when performing special processing such as finalization. In the initialization stage, such file system data cannot be written to the disc. However, in a write-once disc such as a DVD-R or CD-R, an unrecorded area is not left, and a recording area immediately after the recorded area is not stored. Data must be written sequentially from the logical sector. If writing of user data is started immediately after VRS, file system data can no longer be written to this area when additional writing is performed. On the other hand, when file system data is written in this area, the contents of the disc are fixed, and subsequent additional recording becomes impossible. Therefore, in this embodiment, the first reserved area is placed in the area including the final file system data recording location, so that the reserved area can be maintained while the file system data can be written during special processing such as finalization. The data can be written from the logical sector immediately after.

  The file system data to be finally written in the first reserved area here is specifically AVDP. AVDP is pointer information indicating a VDS describing information about the contents of a volume structure such as pointer information to a root directory.

  In UDF, VDS is allowed to be freely arranged in a volume structure (packet structure) in which a packet is written. On the other hand, as one of the restrictions and indispensable conditions for data writing, the AVDP is placed at least in two places, the 256th logical sector and the last logical sector number N and the logical sector number before 256 sectors from the recorded N. It is agreed to record AVDP. It is necessary to analyze the VDS in order to perform playback processing of the disc in accordance with the UDF format, and the above-mentioned arrangement regarding the arrangement of the AVDP is extremely important in order to access the VDS.

  As shown in FIG. 3, since there is no volume structure immediately after initialization and no VDS is described, there is no AVDP. Further, the final AVDP contents are not determined until the additional recording on the disc is completed. When AVDP (1st AVDP) is recorded in the 256th logical sector during the initialization process, VDS information is determined at that time, and additional recording is performed on this optical disc in a format conforming to UDF. It becomes impossible to do.

  Of course, without writing the first reserved area described above, writing of user data is started immediately after the VRS and each time additional recording is performed on the disk, the last logical sector number N is always included in each packet structure. And even if AVDP is written in two locations of logical sector numbers just before 256 sectors from N, the above-mentioned restrictions and essential conditions defined by UDF can be satisfied. In this case, the AVDP cannot be placed in the 256th logical sector.

  However, the AVDP located on the outer peripheral side is susceptible to damage such as the shake of the user's hand handling the disk, and the AVDP of the inner peripheral side, that is, the 256th logical sector number is less susceptible to damage, and the last logical sector numbers N and N In consideration of the fact that both of the two AVDPs are susceptible to damage at a location close to only 256 sectors from the first, the AVDP (1st AVDP) is finally applied to the 256th logical sector at least one of the three locations separated from the outer peripheral side. Has a request to write. In particular, in a reproduction-only device manufactured at a low cost, only the 256th logical sector number AVDP can be read, and compatibility cannot be ensured unless the 256th logical sector number AVDP is written.

  In the present embodiment, as shown in FIG. 3, by setting the area from immediately after writing VRS to the 511st logical sector number as a reserved area at the time of initialization, the 256th logical sector number is set in the future. It is possible to perform additional recording of data in an unrecorded area (partition) provided after the 1024th while maintaining a state in which AVDP can be written.

  In this way, at each additional recording until the disc is finalized, each additional recording is performed by sequentially writing AVDP in two locations of the logical sector number just before 256 sectors from the last logical sector number N and N. The disc at the time of recording is in conformity with the UDF format, ensuring compatibility with a conventional data reproduction dedicated device. However, there is a risk that AVDP recording may fail due to power interruption of the recording device or other unforeseen circumstances while recording user data to the disc, making it impossible to analyze the file system data, or re-analyzing the disc It takes a long processing time to achieve a stable state. Although the recording operation rarely fails, when additional recording is frequently performed, the possibility of the failure increases because an AVDP recording operation is accompanied each time. Therefore, in the present embodiment, the second reserved area is used for sequentially backing up AVDP generated at every additional recording.

  FIG. 4 shows a processing procedure for formatting an optical disc in the form of a flowchart. This processing procedure is actually realized in a form in which the central processing unit 5 executes a predetermined program code.

  First, an area with logical sector numbers 0 to 511 is reserved as a first reserved area (step S1), and an area with logical sector numbers 512 to 1023 is reserved as a second reserved area (step S1). S2).

  Next, after dummy data is recorded in the area of logical sector numbers 0 to 15 and padding is performed (step S3), VRS which is one of the standard information defined by UDF from the sector with logical sector number 16 is used. Is recorded (step S4), and the formatting of the disc is completed.

  FIG. 5 shows a data layout after one additional recording is performed on the optical disc that has been initialized with the data layout shown in FIG.

  For writing to the disk, a packet writing method is applied (described above). The writing of the user data file is started from the 1024th logical sector immediately after the reserved area, and then the file system data related to this is written. The file system data is a UDF file data structure describing information about the UDF file system, VDS, LVIS, AVDP, or the like.

  VDS (Volume Descriptor Sequence) is a file system configuration in the optical disc that describes the contents of the volume structure such as the start position of partition (Partition) and LVIS (Logical Volume Integrity Sequence), and pointer information to the root directory. Consists of basic information.

  LVIS is data including information related to the state of the optical disk, such as the free area size of the optical disk and the number of files.

  AVDP (Anchor Volume Descriptor Pointer) is data including information on the start position and size of the VDS.

  In UDF, VDS and LDVIS can be freely arranged in the volume structure in which the packet is written. However, the arrangement of two VDSs, the AVDP as the 256th logical sector (1st AVDP), and recording It is agreed that AVDP is recorded in at least two of the three logical sector numbers N (3rd AVDP) and the logical sector number (2nd AVDP) before 256 sectors before N.

  As shown in FIG. 5, in the state in which additional recording is still performed on the disc (that is, in the state where finalization processing is not performed), the final AVDP cannot be written in the 256th logical sector, but recording has been completed at this point. However, since AVDP is recorded in two locations (that is, 2nd AVDP and 3rd AVDP) preceding the logical sector number N and N by 256 sectors before the last logical sector number N, there is no conflict with the UDF format and the disc playback apparatus Compatibility can be secured. Also, padding is applied to the surplus area between the 2nd AVDP and the 3rd AVDP.

  In addition, the same data recorded in the 2nd AVDP and 3rd AVDP is recorded in preparation for the risk of AVDP recording failure due to power interruption of the recording device or other unforeseen circumstances while recording user data on the disc. 2 is recorded in the logical sector having the largest LSN in the reserved area (that is, Next Writeable Area) (in this case, the 1024th logical sector).

  FIG. 6 shows a data layout after one additional recording is performed on the optical disk after the one additional recording shown in FIG. 5 is performed.

  A packet writing method is applied to writing to the disk (same as above). Following the last sector of the recorded area (that is, from the next writeable area of the user data area), writing of the user data file is started without leaving an unrecorded logical sector, and the file system immediately thereafter • Data is written.

  The file system data includes information on the UDF file structure, FSDS, VDS, LVIS, AVDP, etc., and the last logical sector number N that has been recorded and each AVDP arranged at the logical sector number before 256 sectors from N (That is, 2nd AVDP and 3rd AVDP) indicate the respective VDS, and padding is applied to the surplus area between the two AVDPs.

  Here, each time additional recording is performed on the disc, each newly written AVDP does not point to the old VDS, so the previously recorded file system data is no longer referenced from the newly recorded file system data. It becomes invalid data.

  In addition, the same data recorded in the 2nd AVDP and 3rd AVDP is recorded in preparation for the risk of AVDP recording failure due to power interruption of the recording device or other unforeseen circumstances while recording user data on the disc. 2 is recorded in the logical sector having the largest LSN in the reserved area (that is, Next Writeable Area).

  As shown in FIG. 6, in a state where additional recording is still performed on the disc (that is, a state where finalization processing has not been performed), the final AVDP cannot be written in the 256th logical sector, but recording has been completed at this point. However, since the AVDP is recorded in two locations of the last logical sector number N and 256 sectors before the logical sector number N, the UDF format is not violated and compatibility with the disk playback device can be ensured. ing.

  FIG. 7 is a flowchart showing a processing procedure for recording user data as shown in FIGS. 5 and 6 on a formatted disc (including a disc after additional recording and before finalization processing). It is shown in the form of This processing procedure is actually realized in a form in which the central processing unit 5 executes a predetermined program code.

  First, file data is recorded in such a manner that a file is additionally recorded in the outermost logical sector of the recorded area (step S11).

  Next, the UDF file data structure is recorded in the form of additional recording in the file data (step S12).

  Next, two VDSs and LVIS are recorded in the form of additional recording in the UDF file data structure file data (step S13). Within the volume structure, VDS and LVIS can be freely arranged.

  Next, AVDP is recorded in the form of additional recording in the above VDS and LVIS (step S14). This AVDP points to two VDSs, respectively.

  Further, after dummy data is recorded for 255 sectors in the form of additional recording in the AVDP and padded (step S15), the AVDP indicating two VDSs is recorded in the form of additional recording in the dummy data. (Step S16).

  After recording 2nd AVDP and 3rd AVDP in this way, 2nd AVDP and 3rd AVDP are prepared for the risk of failing to record AVDP due to power interruption of the recording device or other unforeseen circumstances while recording user data on the disc. The same data as that recorded in the second reserved area is recorded in the logical sector having the largest LSN in the second reserved area (ie, Next Writeable Area) (step S17).

  FIG. 8 shows a data layout after finalizing the optical disk shown in FIG.

  As shown in FIG. 6, the logical sector from the 32nd logical sector to the 511th logical sector immediately before the second reserved area is the first reserved area.

  In the finalizing process, AVDP recording is started from the 256th logical sector in accordance with restrictions and essential conditions concerning data writing in UDF. Then, dummy data is written and padded in the logical sector from the 32nd logical sector to the 255th logical sector immediately before AVDP recording, and the 511th logical sector immediately after AVDP recording.

  In the second reserved area, dummy data is written in the 1023rd logical sector from the logical sector (that is, the next writeable area) after the AVDP for backup is recorded last to perform padding.

  AVDP (1st AVDP) recorded from the 256th logical sector indicates two VDSs in the file system data recorded by the last additional recording. At this time, the VDS information is determined. It becomes impossible to perform additional recording on the optical disc in a format conforming to UDF.

  The two AVDPs (2nd AVDP and 3rd AVDP) in the file system data recorded by the last additional recording can satisfy the restrictions and essential conditions regarding data writing in UDF, but they are located on the outer circumference side. AVDP is susceptible to damage such as shaking of the user's hand handling the disc. On the other hand, the AVDP of the inner periphery side, that is, the 256th logical sector number is hardly damaged. In addition, there is a read-only device that can read only the AVDP of the 256th logical sector number, and according to the data layout as shown in FIG. 8, wide compatibility can be ensured.

  FIG. 9 shows a processing procedure for finalizing the disc in the form of a flowchart. This processing procedure is actually realized in a form in which the central processing unit 5 executes a predetermined program code.

  First, dummy data is recorded in an area up to 255 in the area reserved at the time of disk formatting and padding is performed (step S21).

  Next, AVDP recording is performed from the 256th logical sector (step S22). The AVDP recorded here indicates the two VDSs in the file system data recorded by the last additional recording. At this time, the VDS information is determined. Thereafter, the optical disc conforms to the UDF. It becomes impossible to perform additional recording in the format.

  Then, dummy data is recorded in the extra reserved area from the end of AVDP recording to the 1023rd logical sector, padding is performed (step S23), and the process of closing the boundary of the disk is performed (step S24). ), The finalizing process is terminated.

  Up to this point, the description has been given of the case where all the processes from the initialization (formatting) of the write-once disc to the finalization are completed successfully. However, in reality, there is no possibility that the recording apparatus may be turned off or other unforeseen circumstances may occur during recording of user data on the disc.

  FIG. 6 shows a data layout after one additional recording is performed on the optical disc after the one additional recording shown in FIG. 5 is performed. In contrast to this, the data layout is shown when user data recording is interrupted due to power interruption or the like during the second additional recording. In FIG. 10, during the writing of the user data file following the last sector of the recorded area, the recording operation is interrupted without recording the file system data. In other words, there is no effective AVDP (that is, 2nd AVDP and 3rd AVDP) in two places before 256 sectors from the last logical sector numbers N and N. Further, since the finalizing process is not performed, there is no effective AVDP (that is, 1st AVDP) in the 256th logical sector. Thus, since there is no effective AVDP in any of the three specified locations, the disc conflicts with the UDF format, and compatibility is not compensated at all when the disc is replaced with another disc reproducing apparatus.

  On the other hand, as described above, in this embodiment, an AVDP backup is recorded in the second reserved area every time additional recording is performed on the disc. That is, since the AVDP that was valid until immediately before the additional recording failed is recorded in the logical sector having the largest LSN in the second reserved area, the last one is based on this newest AVDP. By recording 2nd AVDP and 3rd AVDP in two places before 256 sectors from the logical sector numbers N and N, the state immediately before the failed additional recording is simulated and the disk can be additionally recorded Can be repaired.

  FIG. 11 shows a data layout when the disk in which user data recording shown in FIG. 10 is interrupted is repaired.

  When the AVDP recorded in the logical sector having the largest LSN in the second reserved area is read, 2nd AVDP and 2nd AVDP and 256 sectors before the last logical sector number N and N are read based on the AVDP. By recording 3rd AVDP, the state before the user data additional recording fails is restored. Of course, the data layout shown in FIG. 5 is different from the data layout shown in FIG. 5 (the user data in which the additional recording is interrupted becomes an invalid area). From the 2nd AVDP and the 3rd AVDP, an effective user Since file system data such as VDS for accessing data can be referred to, it conforms to the UDF format and is compatible with other data reproducing apparatuses. Further, similarly to the data format shown in FIGS. 5 and 6, additional user data can be recorded from the outermost periphery.

  FIG. 12 is a flowchart showing a processing procedure for repairing a disc that has failed in additional recording to a state in which additional recording is possible. This processing procedure is actually realized in a form in which the central processing unit 5 executes a predetermined program code.

  First, AVDP reading is attempted from the logical sector having the largest LSN in the second reserved area (step S31).

  Here, when the AVDP cannot be read from the logical sector having the largest LSN in the second reserved area (No in step S32), it is determined that the process has failed and the entire processing routine is terminated. .

  On the other hand, when the AVDP can be read from the logical sector having the largest LSN in the second reserved area (Yes in step S32), the outermost logical sector of the written area is based on the read AVDP. The first AVDP (2nd AVDP) is recorded in the number (step S33). This AVDP points to two valid VDSs.

  Further, after the dummy data is recorded for 255 sectors in the form of additional recording in the AVDP and padded (step S34), the second data indicating the two VDSs is recorded in the form of additional recording in the dummy data. AVDP (3rd AVDP) is recorded (step S35).

  FIG. 13 is a flowchart showing a disc recognition process performed when a disc on which user data has already been recorded is loaded in the recording unit 4. This processing procedure is actually realized in a form in which the central processing unit 5 executes a predetermined program code.

  First, the outermost periphery of the recorded area or the 256th logical sector is accessed to obtain file system data and analyze it (step S41).

  Here, when the analysis of the file system data has failed (No in step S42), since the recording of the user data is interrupted as shown in FIG. 10, the loaded disc is in a state in conflict with the UDF format. There is a possibility. Therefore, in this case, a repair process is performed on the disk (step S47).

  The repair process in step S47 is performed according to the process procedure shown in FIG. Then, when an AVDP backup is recorded in the second reserved area of the disc, 2nd AVDP and 3rd AVDP are recorded at two locations just before 256 sectors from the last logical sector numbers N and N based on this. As a result, it is possible to restore the state (see FIG. 11) before the user data additional recording failed. When step S47 is completed, it is checked whether or not the process is successful (step S48). If the restoration process is successful, the process returns to step S41. If the restoration process is not successful, it is determined that the disk recognition has failed, and the entire processing routine is terminated.

  When the analysis of the file system data is successful or the file system data can be analyzed by the disk repair process (Yes in step S42), subsequently, whether the loaded disk can be additionally recorded is checked. Determination processing is performed (step S43). This additional recording permission / inhibition determination process is separately defined.

  If it is determined that additional recording is not possible (No in step S44), the disk is subsequently recognized as a read-only disk (step S45). If it is determined that additional recording is possible (step S44). After that, it is recognized as a disc that can be additionally recorded (step S46).

  FIG. 14 shows, in the form of a flowchart, the procedure of the process for determining whether or not to allow additional recording to the disc, which is executed in step S43 of the flowchart shown in FIG. This processing procedure is actually realized in a form in which the central processing unit 5 executes a predetermined program code.

  First, the 256th logical sector is accessed to check whether AVDP is recorded (step S51).

  If AVDP is recorded in the 256th logical sector, it is subsequently checked whether the border of the recording area is closed (step S52).

  If the border is closed, it is determined that the disc is in a recordable state (step S53).

  On the other hand, if the AVDP is not recorded in the 256th logical sector, or if the AVDP is recorded in the 256th logical sector but the border is not closed, the disc is determined to be in an additionally recordable state. (Step S54).

  The present invention has been described in detail above with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiment without departing from the gist of the present invention.

  In the present specification, the embodiment in which the present invention is applied when additional recording is performed on an optical disc that can be recorded only once according to the UDF format established by OSTA has been described. However, the gist of the present invention is limited to this. It is not done. File system data whose contents are not fixed until the end of additional recording is placed on the inner circumference side of the disk, but the file system has the same restriction that data must be recorded continuously from the innermost circumference When the format is imposed, the same effect can be obtained by applying the present invention. In addition, the type of the recording medium is not particularly limited to the optical disc.

  In short, the present invention has been disclosed in the form of exemplification, and the description of the present specification should not be interpreted in a limited manner. In order to determine the gist of the present invention, the claims should be taken into consideration.

FIG. 1 is a diagram schematically illustrating a hardware configuration of a digital camera 10 according to an embodiment of the present invention. FIG. 2 is a diagram showing an internal hardware configuration of the recording unit 4. FIG. 3 is a diagram showing a data layout immediately after the initialization process is performed on the optical disc. FIG. 4 is a flowchart showing a processing procedure for formatting an optical disc. FIG. 5 is a diagram showing the data layout after one additional recording is performed on the optical disc that has been initialized with the data layout shown in FIG. FIG. 6 is a diagram showing a data layout after one additional recording is performed on the optical disc after the one additional recording shown in FIG. 5 is performed. FIG. 7 is a flowchart showing a processing procedure for recording user data on a formatted disc (including a disc after additional recording and before finalization processing). FIG. 8 is a diagram showing a data layout after finalizing the optical disk shown in FIG. FIG. 9 is a flowchart showing a processing procedure for finalizing a disc. FIG. 10 shows a case where recording of user data is interrupted due to a power interruption or the like while one additional recording is performed on the optical disc after the one additional recording shown in FIG. 5 is performed. It is the figure which showed the data layout. FIG. 11 is a diagram showing a data layout when the disk in which the recording of user data shown in FIG. 10 is interrupted is repaired. FIG. 12 is a flowchart showing a processing procedure for repairing a disc in which additional recording has failed to a state where additional recording is possible. FIG. 13 is a flowchart showing the procedure of disc recognition processing that is performed when a disc on which user data has already been recorded is loaded in the recording unit 4. FIG. 14 is a flowchart showing the procedure of the process for determining whether or not to allow additional recording on the disc, which is executed in step S43 of the flowchart shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Camera block 2 ... Image signal calculating part 3 ... Data buffer 4 ... Recording part 5 ... Central processing part 6 ... Temporary storage medium 10 ... Digital camera 13 ... OP part 14 ... RF processing part 15 ... Servo signal processing part 16 ... Analog filter unit 17 ... Signal processing unit 18 ... Spindle driver 19 ... Thread driver 20 ... Tracking driver 21 ... Focus driver 22 ... Spindle motor 23 ... Thread motor 25 ... Recording medium (optical disk)

Claims (6)

A data recording apparatus for performing additional recording on a disk composed of a plurality of logical sectors according to a predetermined file system format, wherein the first logical sector on the inner circumference side of the disk is used in the predetermined file system format. In addition, it is determined to record the reference information for the file system data in at least two of the second and third logical sectors on the inner circumference side from the last logical sector that has been recorded,
The standard information is recorded at a predetermined logical sector position from the innermost circumference of the disk, the first reserved area including the first logical sector is reserved immediately after the recording of the standard information, and the first Disk initialization means for reserving the second reserved area immediately after the reserved area and immediately before the fourth logical sector serving as the file / data recording start position, and for initializing the disk;
A fourth logical sector immediately after the second reserved area (in the case of a disk in which file data has not been recorded immediately after initialization), or a continuous file from the logical sector immediately after the recorded area Data recording means for recording data and file system data, and for recording reference information for file system data in two locations of the second and third logical sectors on the inner circumference side from the last logical sector that has been recorded When,
Reference information backup means for recording a backup of reference information from the innermost circumference of the unused area in the second reserved area to the file system data recorded by the data recording means;
A data recording apparatus comprising: The predetermined file system format is UDF (Universal Disk Format) formulated by OSTA (Optical Storage Technology Association).
The data recording apparatus according to claim 1, wherein: When a disk is newly loaded, the disk is analyzed by analyzing file system data at two locations of the second and third logical sectors on the inner circumference side from the last logical sector on which the disk has been recorded. Disc recognition means for recognizing
When the disk recognizing unit cannot recognize the disk, the reference information to the file system data backed up in the logical sector having the largest value in the second reserved area is read, and the recording after the fourth logical sector is recorded. The reference information is recorded in two locations of the second and third logical sectors on the inner circumference side from the last logical sector that has been completed, and the disk is restored to a state where it can be additionally recorded by the data recording means. Repair means,
The data recording apparatus according to claim 1, further comprising: When the additional recording to the disk is completed by the data recording means, the last recorded file is padded with dummy data from the inner circumference side of the reserved area to immediately before the first logical sector. Finalization processing means for starting recording of reference information for system data from the first logical sector and padding an area from immediately after the recording of the reference information to immediately before the fourth logical sector with dummy data; In addition,
The data recording apparatus according to claim 1, wherein: A data recording method for performing additional recording on a disk composed of a plurality of logical sectors according to a predetermined file system format, wherein the first logical sector on the inner circumference side of the disk is used in the predetermined file system format. In addition, it is determined to record the reference information for the file system data in at least two of the second and third logical sectors on the inner circumference side from the last logical sector that has been recorded,
The standard information is recorded at a predetermined logical sector position from the innermost circumference of the disk, the first reserved area including the first logical sector is reserved immediately after the recording of the standard information, and the first A disk initialization step for reserving the second reserved area immediately after the reserved area and immediately before the fourth logical sector serving as the file data recording start position, and for initializing the disk;
A fourth logical sector immediately after the second reserved area (in the case of a disk in which file data has not been recorded immediately after initialization), or a continuous file from the logical sector immediately after the recorded area Data recording step for recording data and file system data, and recording reference information for the file system data in two locations of the second and third logical sectors on the inner circumference side from the last logical sector that has been recorded When,
A reference information backup step of recording a backup of reference information from the innermost circumference of the unused area in the second reserved area to the file system data recorded by the data recording means;
Disc recognition step for recognizing the disc by analyzing file system data at two locations of the second and third logical sectors on the inner circumference side from the last logical sector on which the newly loaded disc has been recorded When,
When the disc cannot be recognized in the disc recognition step, the reference information to the file system data backed up in the logical sector having the largest value in the second reserved area is read, and the recording after the fourth logical sector is completed. The reference information is recorded in two locations of the second and third logical sectors on the inner circumference side from the last logical sector, and the disc is repaired so that the disc can be additionally recorded in the data recording step. Steps,
When the additional recording to the disk is finished, padding is performed from the inner circumference side of the reserved area to immediately before the first logical sector with dummy data, and a reference to the file system data recorded last is added A finalize processing step of starting information recording from the first logical sector and padding an area from immediately after the recording of the reference information to immediately before the fourth logical sector with dummy data;
A data recording method comprising: According to a predetermined file system format, a computer program described in a computer-readable format so that a process for performing additional recording on a disk composed of a plurality of logical sectors is executed on a computer,
In the predetermined file system format, at least two of the first logical sector on the inner circumference side of the disk and the second logical sector on the inner circumference side from the last logical sector on which recording has been performed are placed in the file system. It is decided to record reference information for the data,
For the computer
The standard information is recorded at a predetermined logical sector position from the innermost circumference of the disk, the first reserved area including the first logical sector is reserved immediately after the recording of the standard information, and the first A disk initialization procedure for reserving the second reserved area from immediately after the reserved area to immediately before the fourth logical sector as the file / data recording start position, and for initializing the disk;
A fourth logical sector immediately after the second reserved area (in the case of a disk in which file data has not been recorded immediately after initialization), or a continuous file from the logical sector immediately after the recorded area Data recording procedure for recording data and file system data, and recording reference information for the file system data in the second and third logical sectors on the inner circumference side from the last logical sector that has been recorded When,
A reference information backup procedure for recording a backup of reference information from the innermost circumference of the unused area in the second reserved area to the file system data recorded by the data recording means;
Disc recognition procedure for recognizing a disc by analyzing file system data at two locations of the second and third logical sectors on the inner circumference side from the last logical sector on which a newly loaded disc has been recorded When,
When the disk cannot be recognized by executing the disk recognition procedure, the reference information to the file system data backed up in the logical sector having the largest value in the second reserved area is read, A repair procedure for recording the reference information in two locations of the second and third logical sectors on the inner circumference side from the last recorded logical sector and repairing the disc to a state in which additional recording is possible; ,
When the additional recording to the disk is finished, padding is performed from the inner circumference side of the reserved area to immediately before the first logical sector with dummy data, and a reference to the file system data recorded last is added A finalizing process procedure in which information recording is started from the first logical sector, and an area from immediately after the recording of the reference information to immediately before the fourth logical sector is padded with dummy data;
A computer program for executing

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