KR100936025B1 - Apparatus for recording information on a write-once disc, a method for shortening its access time, and the disc - Google Patents

Abstract

Disclosed are an apparatus for recording information on a write once disc, a method for shortening its access time, and a disc.

A single recording layer write once disc in which a lead-in area, a data area and a lead-out area are arranged in sequence, comprising: at least one of the lead-in area, data area and lead-out area At least one update area provided in and recording predetermined information to be updated; And an access information area provided in at least one of the lead-in area and the lead-out area to record position information indicating a position at which the information last updated in the update area is recorded at a predetermined period. This makes it possible to further shorten the access time for reading the updated information in the case of the recording disc once the predetermined information is updated and recorded in the new position.

Description

A recording apparatus for write once disc, method for reducing access time to write once disc and disc etc.

1 is a block diagram of a recording apparatus according to a preferred embodiment of the present invention;

2 is a structural diagram of a disk 100 according to a preferred embodiment of the present invention,

3 is a structural diagram of a disk 100 according to a preferred embodiment of the present invention,

4 is a reference diagram showing how information is recorded on the disc 100 according to an embodiment of the present invention;

5A to 5D are reference diagrams showing position information recorded in an access information area according to a preferred embodiment of the present invention;

6 is a data structure diagram of the location information AA #i of FIGS. 4 and 5;

7 is a reference diagram showing a method of recording information on the disc 100 according to another embodiment of the present invention;

FIG. 8 is a data structure diagram of any information A #i recorded in the update area A of FIG. 7;

9 shows an embodiment of a disk 100 according to a preferred embodiment of the present invention,

FIG. 10 is a reference diagram for describing in more detail a process of writing data in a user data area A and a spare area B according to an embodiment of the present invention.

The present invention relates to the field of recording information on a write once disc or reproducing recorded information, and more particularly, to an apparatus for recording information on a write disc once, a method for shortening its access time, and a disc. will be.

Once a write-once disc cannot be written over an area where information has already been recorded, as in the case of a rewritable disc, that is, once the information has been written, it cannot be erased and written again. Should be assigned and recorded.

In practice, the updated information is most often the only information that is finally updated. Therefore, the recording device or the reproduction device searches for the last updated information while scanning the corresponding area to read the last updated information. The more information you need to update, the longer it takes to get the latest information. This is because, in the case of a write-once disc, the location where the latest information is stored is different each time it is updated, unlike a rewritable disc. If you reduce the size of the area to save scanning effort, you can find the information faster, but the number of updates you can make decreases.

 Accordingly, the technical problem to be achieved by the present invention relates to a method of recording information in a data structure that can shorten the access time for reading updated information in the case of a recording disc and a disc.

The above technical problem is that the lead-in area, the data area and the lead-in area, the data area and the lead-out area are arranged in this order in a single recording layer write once disc according to the present invention. At least one update area provided in at least one of the lead-out areas, in which predetermined information to be updated is recorded; And an access information area provided in at least one of the lead-in area and the lead-out area, the location information indicating a location where the information last updated in the update area is recorded at a predetermined period. Is achieved by.

In addition, the write once includes a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in this order. write once) a disk, comprising: at least one update area provided in at least one of the lead-in area, data area, lead-out area, and outer area so that predetermined information is updated and recorded sequentially; And an access information area provided in at least one of the lead-in area, the lead-out area, and the outer area, wherein location information indicating a location at which information was last updated in the update area is recorded at predetermined intervals. It is also achieved by a disk characterized in that.

Or a single recording layer write once disc having a lead-in area, a data area, and a lead-out area arranged in this order, wherein at least one of the lead-in area, a data area, and a lead-out area are provided. A plurality of update areas provided in advance and predetermined information is updated and recorded sequentially; And an access information area provided in at least one of the lead-in area and the lead-out area, wherein location information indicating a location at which information was last updated in the update area is recorded at predetermined intervals. It is also achieved by the disc characterized in that position information indicative of the position at which the last updated information is recorded is recorded in at least one of the remaining update areas.

Alternatively, write once including a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in this order. write once) A disk comprising: a plurality of update areas provided in at least one of the lead-in area, data area, lead-out area, and outer area, wherein predetermined information is updated and sequentially recorded; And an access information area provided in at least one of the lead-in area, the lead-out area, and the outer area, wherein location information indicating a location at which information was last updated in the update area is recorded at predetermined intervals. And at least one of the update areas is recorded with at least one of the remaining update areas in which position information indicating a position at which the last updated information is recorded is recorded.

Preferably, the position information of the access information area is recorded every time a predetermined number of recording operations are completed, or each time information is filled in a predetermined number of blocks of the update area, or repeatedly recorded. Alternatively, it is preferable that any one of the update areas is recorded when a predetermined number of recording operations are performed, or when the sum of the number of times that predetermined information is updated in the update area is a predetermined number.

On the other hand, according to another field of the present invention, the technical problem is directed to a method for shortening the access time to a single write layer write once disk in which the lead-in area, the data area and the lead-out area are arranged in this order. (A) sequentially recording predetermined information updated in at least one update area provided in at least one of a lead-in area, a data area and a lead-out area of the disc; And (c) recording, at predetermined intervals, position information indicating a position at which the information last updated in the update area is recorded in an access information area provided in at least one of the lead-in area and the lead-out area. It is also achieved by a method characterized in that.

Further, a method of shortening the access time to a single recording layer write once disc in which a lead-in area, a data area and a lead-out area are arranged in sequence, comprising: (a) the lead-in area and data; Sequentially recording predetermined information updated in the plurality of update areas provided in at least one of the area and the lead-out area; (b) recording location information indicating a location in which at least one piece of updated information is recorded in at least one of the remaining update areas in one of the update areas; And (c) recording, at predetermined intervals, position information indicating a position at which the information last updated in the update area is recorded in an access information area provided in at least one of the lead-in area and the lead-out area. It is also achieved by the method characterized in that.

In addition, the write once includes a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in this order. write once) A method for shortening the access time to a disc, comprising: (a) writing predetermined information updated in at least one update area provided in at least one of the lead-in area, data area, lead-out area, and outer area; Recording each sequentially; And (c) recording, at predetermined intervals, position information indicating a position at which the information last updated in the update area is recorded in an access information area provided in at least one of the lead-in area, the lead-out area, and the outer area. Method comprising a.

In addition, the write once includes a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in this order. write once) A method of shortening the access time to a disc, the method comprising: (a) sequentially recording predetermined information updated in a plurality of update areas provided in at least one of the lead-in area, the lead-out area, and the outer area, respectively; Making; (b) recording location information indicating a location in which at least one piece of updated information is recorded in at least one of the remaining update areas in one of the update areas; And (c) recording, at predetermined intervals, position information indicating a position at which the information last updated in the update area is recorded in an access information area provided in at least one of the lead-in area, the lead-out area, and the outer area. It is also achieved by a method comprising a.

The step (c) is executed every time a predetermined number of recording operations are finished, or each time a predetermined number of blocks of the update area is filled, or repeatedly recording the position information in the access information area a plurality of times. Is preferred. Alternatively, step (c) may be performed when any one of the update areas has a predetermined number of recording operations or the sum of the number of times that predetermined information is updated in the update area is a predetermined number.

On the other hand, according to another aspect of the present invention, the technical problem is an apparatus for recording information on a single write layer write once disk in which the lead-in area, the data area and the lead-out area are arranged in order. A recording / reading unit for recording or reading information on the disc; And sequentially record predetermined information in at least one update area provided in at least one of a lead-in area, a data area, and a lead-out area of the disc, and at least one of the lead-in area and the lead-out area. Also achieved by an apparatus comprising a control unit for controlling the recording / reading unit to record position information indicating a position at which information last updated in the update area is recorded in a predetermined period in an access information area provided in one. do.

Or an apparatus for recording information on a single recording layer write once disk having a lead-in area, a data area and a lead-out area arranged in sequence, the apparatus for recording or reading information on the disk; Reading unit; And sequentially write predetermined information updated in a plurality of update areas provided in at least one of the lead-in area, the data area, and the lead-out area, respectively, and at least one of the remaining update areas in one of the update areas. Record position information indicating a position at which the updated information is recorded, and write a position where the information last updated in the update area is recorded in an access information area provided in at least one of the lead-in area and the lead-out area. It is also achieved by an apparatus comprising a control unit for controlling the recording / reading unit to record informing position information at predetermined intervals.

Alternatively, write once including a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in this order. write once) an apparatus for recording information on a disk, comprising: a recording / reading unit for recording or reading information on the disk; And sequentially write predetermined information to be updated in at least one update area provided in at least one of the lead-in area, data area, lead-out area, and outer area, and respectively write the lead-in area, lead-out area, and And a control unit for controlling the recording / reading unit to record, at predetermined intervals, position information indicating a position at which the information last updated in the update area is recorded in the access information area provided in at least one of the outer areas. It is also achieved by the device.

Alternatively, write once including a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in this order. write once) an apparatus for recording information on a disk, comprising: a recording / reading unit for recording or reading information on the disk; And sequentially record predetermined information updated in a plurality of update areas provided in at least one of the lead-in area, data area, lead-out area, and outer area, and at least one of the remaining update areas in any one of the update areas. Location information indicating a position at which the last updated information is recorded in one is recorded, and updated in the update area in an access information area provided in at least one of the lead-in area, the lead-out area and the outer area; It is also achieved by an apparatus comprising a control unit for controlling the recording / reading unit to record the position information indicating the position at which the information is recorded, at a predetermined period.

The control unit controls the recording / reading unit to record the location information in the access information area every time a predetermined number of recording operations are terminated, or the predetermined amount of blocks in the update area is filled in the access information area. Preferably, the recording / reading unit is controlled to record position information, or the recording / reading unit is controlled to record updated information in the update area for each recording operation. Alternatively, the control unit controls the recording / reading unit to record the location information in the access information area when any one of the update areas has been recorded a predetermined number of times, or the number of times that predetermined information is updated in the update area. If the sum is a predetermined number, it is preferable to control the recording / reading unit to record the location information in the access information area.

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

1 is a block diagram of a recording apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 1, the recording apparatus includes a recording / reading section 1, a control section 2, and a memory section 3. The recording / reading section 1 records data on the disk 100, which is an information storage medium according to the present embodiment, and reads data to verify the recorded data. The control unit 2 controls the recording / reading unit 1 to record data in the data structure according to the present invention. That is, a position in which predetermined information to be updated is sequentially recorded in at least one update area provided in the disc 100, and the position where the last updated information is recorded in the update area is recorded in the access information area provided in the disc 100. The recording / reading section 1 is controlled to record the information at predetermined intervals. In the present embodiment, the information recorded in the update area is recorded for each recording operation to be described later, and the position information recorded in the access information area is recorded every time a predetermined number of recording operations are completed or is provided to record the information in the update area. Each time a number of logical or physical blocks are filled, they are written. Alternatively, when the at least one update area of the plurality of update areas is updated a predetermined number of times or the sum of the number of times the update area is updated to the plurality of update areas is recorded, the number is updated. Furthermore, when there are a plurality of update areas on the disc 100, the controller 2 accesses the location information indicating the location where the information last updated in at least one of the remaining update areas is recorded in any one of the update areas. Write in the area. At the time of finalizing, the control unit 2 records the positional information indicating the position of the predetermined information last recorded in the update area in the access information area.

The recording operation is a unit of work determined by a user's intention, a recording operation to be performed, and the like. In this embodiment, the disc 100 is loaded into a recording device to perform recording of predetermined information, and then the disc 100 is ejected. Until point. When the user completes the recording of the predetermined information and then presses an eject button (not shown) provided in the recording apparatus to eject the disc 100, the control unit 2 knows that one recording operation is finished.

In particular, in the present embodiment, the control unit 2 tests the recording conditions for adjusting the power of the laser of the recording / reading unit 1, then records information based on the test result and performs defect management. More specifically, in order to adjust the power of the laser, the control unit 2 tests the recording conditions in one or more logical or physical blocks of the recording condition test area, which is one of the update areas provided in the disc 100 for each recording operation. Therefore, there is a need to know where to test the recording conditions next. In the case of the recording condition test area, the updated and recorded information can be regarded as the data recorded for the test. In addition, for defect management, the control unit 2 writes data in predetermined units and then verifies the "verify after write method" in which the defective portion is found by verifying the recorded data. The control unit 2 records user data in units of one recording operation, and then verifies by checking where a defect area occurs, generates defect information indicating where the defect area is found as a result of the inspection, and then stores the generated defect information in the memory unit. The temporary defect management information, which is stored in (3) and collected for a predetermined amount, is recorded in the update area provided on the disk 100 as temporary defect information, that is, in the temporary defect management area and for managing the recorded temporary defect information, is added to the temporary defect management area. Record it. The verification operation after recording during one recording operation is performed at least once, usually a plurality of times. The defect information obtained as a result of performing the verification operation after recording is temporarily stored in the memory unit 3 as temporary defect information. When the recording operation is finished, the control unit 2 reads the temporary defect information stored in the memory unit 3 and provides it to the recording / reading unit 1 and records the information in the temporary defect management area provided in the disc 100. Command

When data recording is completed on the disc 100, that is, when no further data is to be recorded on the disc 100 (finalizing), the control unit 2 records the temporary defect information recorded in the temporary defect management area. And the temporary defect management information are recorded in the defect management area provided in the disc 100.

2 shows the structure of a disk 100 according to a preferred embodiment of the present invention.

Referring to Fig. 2A, when the disc 100 is a single recording layer disc having one recording layer L0, it has a disc structure composed of a lead-in area, a data area and a lead-out area. The lead-in area is located on the inner circumferential side of the disk 100 and the lead-out area is located on the outer circumferential side of the disk 100. The data area is located between the lead-in area and the lead-out area. The data area is divided into a spare area and a user data area. The user data area is an area where user data is recorded, and the spare area is a space provided to compensate for the loss of recording space due to a defect in the user data area, that is, a space provided for defect management, and is recorded in the user data area. If a defect occurs in the data, it is used as an alternative space for recording a new portion of the defect.

Referring to FIG. 2B, when the disc 100 is a dual recording layer disc having two recording layers L0 and L1, the recording layer L0 includes a lead-in area, a data area, and an outer area of the disc 100. The outer peripheral side, the data region, and the lead-out area are sequentially disposed from the inner peripheral side to the outer peripheral side, and the outer region, the data region, and the lead-out area are sequentially arranged from the outer peripheral side of the disc 100 to the inner peripheral side. Unlike the single recording layer disc of FIG. 2A, the lead-out area is also arranged on the inner circumferential side of the disc 100. As shown in FIG. That is, the recording path for recording data is an OTP (Opposite Track Path) from the lead-in area of the recording layer L0 to the area outside of the recording layer L0, and then from the area outside of the recording layer L1 to the lead-out area of the recording layer L1. to be. Spare areas are allocated to recording layers L0 and L1, respectively.

In this embodiment, the spare area exists only between the user data area and the lead-out area or the outer area, but if necessary, the spare area is used between the lead-in area and the lead-out area by utilizing a separate space obtained by dividing the user area. One or more may be disposed.

3 shows the structure of a disk 100 according to a preferred embodiment of the present invention.

3, at least one of a lead-in area and a lead-out area when the disk 100 is a single recording layer disk, and a lead-in area and lead-out when the disk 100 is a dual recording layer disk. At least one of the region and the outer region is provided with an access information region according to the present invention. A plurality of access information areas may be provided in two different areas for the robustness of the information, or may be provided in different locations in different locations.

Furthermore, in at least one of the lead-in area and the lead-out area when the disc 100 is a single recording layer disc, the lead-in area, the lead-out area and the outer area when the disc 100 is a dual recording layer disc. At least one of the more update areas is provided. 3 illustrates two update regions A and B as an example of one or more update regions. Information to be updated is recorded in the update areas A and B, respectively. In this embodiment, predetermined information is updated and recorded in the update areas A and B for each recording operation. However, the updated period may be changed according to the characteristics or needs of the recorded information. In the access information area, position information indicating the position at which the information last updated in the update areas A and B, respectively, is recorded at predetermined intervals. In this embodiment, the positional information is recorded every predetermined number of recording operations or each time the information is recorded and filled in a predetermined number of logical or physical blocks existing in the update area. If necessary, only the positional information indicating the recording position of the information to be updated and recorded in some, not all of the plurality of update regions may be recorded in the access information region.

The update area A is preferably selected in an area in which the size of the block serving as the ECC correction unit is relatively small compared to other areas. At the time of recording, whenever the update area A is updated, location information indicating the location of the last recorded information of at least one other update area is recorded. When it is predicted that the number of recording operations will not be relatively high depending on the characteristics of the data to be recorded and the usage environment, the period for updating the location information recorded in the access information area is set to be relatively short, otherwise the update period is set to be relatively long. do. Furthermore, the timing at which the location information recorded in the access information area should be updated may be variably set.

At the time of reproduction, scanning is performed from the beginning of the access information area to read the last recorded position information to obtain information for accessing the information recorded in the update areas. On the other hand, in the case of finalizing, location information on the last recorded information in the update areas is recorded in the access information area.

In the present embodiment, the update area is disposed in at least one of the lead-in area, the lead-out area, and the outer area, but in some cases, the update area may also exist in the user data area. That is, the update area means an area in which predetermined information is updated and recorded, and it is irrespective of whether the area is arranged (a lead-in area, a lead-out area, an outer area, or a user data area).

4 shows how information is recorded on disc 100 according to one embodiment of the invention.

Referring to FIG. 4, predetermined information is updated n times in the update area A, so that A # 1, A # 2,. , A #n, and predetermined information is updated n times in the update area B, so that B # 1, B # 2,... , B #n. Next, the access information area contains information A #n, which is updated and recorded in the update area A and information B #n, which is finally updated and recorded in the update area B, are recorded, for example, a physical address. Or location information AA # 1 containing the logical address. Again, the predetermined information is updated n times in the update area A and sequentially A # n + 1, A # n + 2,... , A # 2n, predetermined information is updated n times in the update area B, and sequentially, B # n + 1, B # n + 2,... , B # 2n is recorded, AA # 2 is recorded in the access information area. Alternatively, in any positional information AA #i recorded in the access information area, only the positional information of the latest update information recorded in either of the update areas A and B may be recorded.

Furthermore, if predetermined information is first updated n times in either the update area A or the update area B, the location information is recorded in the access information area or the update area A and the update area B are irrespective of the number of times the remaining update area A or B is updated. When the sum of the update counts of n is n, the location information may be recorded in the access information area.                     

5A to 5D show location information recorded in an access information area according to a preferred embodiment of the present invention.

Referring to FIG. 5A, location information is repeatedly recorded in the access information area. More specifically, the first location information AA # 1 is recorded from the beginning of the access information area, that is, the direction in which the physical or logical address increases, and then a copy of AA # 1 is recorded, and the second location information AA # 2 is recorded. Then a copy of AA # 2 is recorded. By recording twice, the reliability and robustness of the information is improved. It is possible to record more than once and the recording position can also be interleaved.

Referring to FIG. 5B, similarly to the case of FIG. 5A, location information is repeatedly recorded in the access information area, but the recording directions thereof are opposite to each other. That is, from the end of the access information area, that is, in the direction of decreasing physical or logical address, the first location information AA # 1 is recorded, followed by a copy of AA # 1, and the second location information AA # 2 is recorded. A copy of AA # 2 is recorded. By recording twice, the reliability and robustness of the information is improved. Similarly, it is possible to record more than once and the recording position can also be interleaved.

Referring to FIG. 5C, the access information area is physically or logically divided into two sub areas, and the first location information AA # 1 and the second location information AA # 2 are sequentially arranged in a direction in which the physical or logical address increases in the first sub area. In the second sub area, a copy of AA # 1 of the first location information and a copy of AA # 2 of the second location information are sequentially recorded. In the recording order, the first location information AA # 1 is recorded, then a copy of AA # 1 is recorded, the second location information AA # 2 is recorded, and then a copy of the second location information copy of AA # 2 is recorded. do. By dividing the area where the location information is recorded, the reliability and robustness of the information is further improved. Alternatively, the access information area may be divided into three or more sub areas and then repeatedly record the location information three or more times.

Referring to FIG. 5D, the access information area is divided into two sub areas physically or logically as in the case of FIG. 5C, but the order in which information is recorded is reversed. That is, the first location information AA # 1 and the second location information AA # 2 are sequentially recorded in the direction in which the physical or logical address decreases in the first sub area, and a copy of AA # 1 and the second copy of the first location information are also sequentially recorded in the second sub area. A copy of AA # 2 of location information is recorded sequentially in the direction of decreasing physical or logical address. The recording order is the same as that of Fig. 5D, in which the first positional information AA # 1 is recorded, then a copy of the first positional information copy of AA # 1 is recorded and the second positional information AA # 2 is recorded, then a copy of the second positional information is copied. AA # 2 is recorded. By dividing the area where the location information is recorded, the reliability and robustness of the information is further improved. Alternatively, the access information area may be divided into three or more sub areas and then repeatedly record the location information three or more times.

6 illustrates a data structure of the location information AA #i of FIGS. 4 and 5.

Referring to FIG. 6, the location information AA #i includes an identifier, an access pointer of the update area A, and an access pointer of the update area B. FIG. The access pointer of the update area A points to the recording position of the most recently updated and recorded information among the predetermined information recorded in the update area A, and the access pointer of the update area B is the most recent of the predetermined information recorded in the update area B. Points to the recording position of the updated and recorded information. For example, the access pointer points to the start address of the last recorded information.

7 shows how information is recorded on disc 100 according to another embodiment of the invention.

Referring to FIG. 7, in the update area A, as in the case of FIG. 4, predetermined information is updated n times and sequentially A # 1, A # 2,... , A #n, and predetermined information is updated n times in the update area B, so that B # 1, B # 2,... , B #n. Next, the access information area contains information A #n, which is updated and recorded in the update area A and information B #n, which is finally updated and recorded in the update area B, are recorded, for example, a physical address. Or location information AA # 1 containing the logical address. Again, the predetermined information is updated n times in the update area A and sequentially A # n + 1, A # n + 2,... , A # 2n, predetermined information is updated n times in the update area B, and sequentially, B # n + 1, B # n + 2,... , B # 2n is recorded, AA # 2 is recorded in the access information area. Alternatively, in any positional information AA #i recorded in the access information area, only the positional information of the latest update information recorded in either of the update areas A and B may be recorded.

Further, the information A # 1, A # 2, ... recorded in the update area A is obtained. , A #n, A # n + 1,... , A # 2n, records position information indicating the position of the latest update information of the update area B. For example, the information A # n + 1 recorded in the update area A points to the position where the corresponding position information B # n + 1 of the update area B is recorded. Therefore, update area A must be updated whenever update area B is updated. Namely, the information A # 1, A # 2, ... recorded in the update area A; Although the predetermined information itself of the update area A among the A #n is not updated, the update area B may be updated because the update area B is updated. If the update points of the plurality of update areas are different and the recording position of the latest information is recorded in the update area A each time the remaining update areas are updated, the size of the update area A is the size of the sum of all the remaining update areas in the worst case. Should be greater than or equal to In order to prevent this from happening, the update areas in which the location information of the latest update information is recorded in the update area A are implemented to have the same update time point, thereby minimizing the size of the update area A as much as possible. Furthermore, after the updated information is recorded in the remaining update areas, the update area A records position information on its own latest update information and at least one of the remaining update areas. The reason for recording the information in the update area A at the end of the update areas as described above is that even if the location where the latest update information is to be recorded in the remaining update areas is determined in advance, the predetermined location may be changed through an error or the like. For example, the location of the latest information to be updated in the update area B is determined in advance, and the location information of the latest information to be recorded in the update area B is recorded in the update area A. The location of B's latest information may change.

FIG. 8 shows the data structure of any information A #i recorded in the update area A of FIG.

Referring to FIG. 8, the update information A #i includes A #i information for the update area A and a B #i pointer indicating the position of the corresponding information B #i of the update area B.

9 shows an embodiment of a disk 100 according to a preferred embodiment of the present invention.

9, in this example, when the disc 100 is a single recording layer disc, an access information area, a defect management area, a temporary defect management area, and a recording condition test area are provided in the lead-in area. Furthermore, at least one of an access information area, a defect management area, a temporary defect management area, and a recording condition test area may be provided in the lead-out area. In summary, the access information area. The defect management area, the temporary defect management area and the recording condition test area may exist in at least one of the lead-in area and the lead-out area, respectively. In the case of the dual recording layer disc, the access information area, the defect management area, the temporary defect management area and the recording condition test area exist in the lead-in area and the lead-out area located on the inner circumferential side of the disc 100, respectively. Similarly, in the case of a dual recording layer disc, the access information area, defect management area, temporary defect management area and recording condition test area are provided in at least one of the lead-in area, the lead-out area and the outer area, respectively.

Here, the temporary defect management area and the recording condition test area correspond to the update area A and the update area B, respectively. Therefore, in the access information area, the location information indicating the location where the temporary management information (temporary defect information and temporary defect management information) is recorded, which is update information recorded in the temporary defect management area, is used last in the recording condition test area. Location information indicating the location of the test area is recorded, for example the start address of the next test area to be used. Only the positional information about the temporary defect management area or the recording condition test area may be selectively recorded in the access information area. Further, in the temporary defect management area, positional information indicating the position of the test area last used in the recording condition test area is recorded.

In the present embodiment, the recording apparatus tests the recording conditions for each recording operation using the recording condition test area, and then records information on the disc 100 based on the result, and temporarily records the temporary defect management area every time the recording operation is completed. Since the management information is recorded, the temporary defect management area and the recording condition test area are updated for each recording operation. In the present embodiment, when the temporary management information is recorded in the temporary defect management area, the positional information of the recording condition test area is recorded together.

In the defect management area, generally, information that affects the entire disc is recorded, such as the structure of the disc for managing the defect, whether or not there is defect management, the position of the defect information, the defect information, the position and size of the spare area.

Typically, a recording or reproducing apparatus reads information in the lead-in area and / or the lead-out area when the disc is loaded into the device to determine how to manage the disc and how to record or play it. The larger the amount of information recorded in the lead-in area and / or the lead-out area, the longer the time required for loading the disc and then preparing for recording or playback occurs. Therefore, in the present embodiment, the concept of temporary management information is introduced and these are recorded in the temporary defect management area provided separately from the defect management area of the lead-in area and / or the lead-out area. In finalizing, temporary management information recorded so far, namely, temporary defect information and temporary defect management information, is finally recorded in the defect management area. This means that when data is no longer needed to be recorded on the disc (when finalizing), only the last meaningful information, which is updated and recorded several times, is finally recorded in the defect management area. This is because when the device reads defect management information from the disk in the future, only the last meaningful information is read from the defect management area so that the device can be initialized more quickly.

In the present embodiment, since defect management is in accordance with the linear substitution scheme, the temporary defect information is composed of information indicating where the defect is generated and information indicating where the newly replaced region is. The temporary defect management information is information for managing the temporary defect information and includes information for indicating a location where the temporary defect information is recorded.

In this embodiment, the temporary defect information and the temporary defect management information are recorded each time the recording operation ends. In the temporary defect management area, information on defects occurring in the data recorded during recording operation # 1 and information on the replacement area is recorded as temporary defect information # 1, and data recorded while recording operation # 2 is performed. The information on the defect and the information on the replacement area generated in " n " Further, in the temporary defect management area, management information for managing the temporary defect information # 1, # 2, ..., that is, information indicative of the position where the temporary defect information # 1, # 2, ... is recorded, respectively is contained in the temporary defect management information # 1, # 2, ... are recorded.

If data can no longer be written to the data area or if you no longer want to write data to the data area, that is, when finalizing, the defect information that was recorded in the temporary defect information area and the temporary defect management information area will be deleted. The defect management information that has been recorded is finally recorded in the defect management area. When finalizing, only meaningful information is read from the defect information recorded in the temporary defect information # 1, # 2, ..., #i recorded so far and recorded again in the defect management area.

FIG. 10 is a reference diagram for describing in more detail a process of writing data in a user data area A and a spare area B according to an embodiment of the present invention.

The unit for processing data may be divided into sectors and clusters. A sector is a minimal unit that can manage data in a computer's file system or application program. A cluster is a minimum unit that can be physically recorded on a disk at one time. Typically, one or more sectors make up a cluster.

Sectors are divided into physical sectors and logical sectors. The physical sector means space for recording one sector of data on the disk. The address for finding a physical sector is called a physical sector number (PSN). The logical sector refers to a sector unit for managing data in a file system or an application program. Similarly, a logical sector number (LSN) is given. A device that records and plays data on a disc finds a location on the disc of data to be recorded or reproduced using a physical sector number. A computer or application for recording or playing data manages the entire data in logical sector units. The data position is also found by the logical sector number. The relationship between the logical sector number and the physical sector number is mapped by the control unit of the recording or reproducing apparatus using a defect status and a recording start position.

Referring to FIG. 10, A means a user data area and B means a spare area. In the user data area and the spare area, there are a plurality of physical sectors (not shown) to which physical sector numbers are sequentially assigned. The logical sector number is given in at least one physical sector unit. However, since the logical sector number is assigned to include the spare area except the defective area generated in the user data area where the defect has occurred, even if the physical sector and the logical sector have the same size, the defective area occurs. The physical sector number and logical sector number do not match.

The method of recording the user data in the user data area is by a continuous recording mode or a random recording mode. In the continuous recording mode, the user data is sequentially recorded in succession, and the random recording mode is not necessarily continuous but in random recording. ① to ⑦ respectively indicate a unit in which a verification operation is performed after recording.

When the recording apparatus 100 is loaded, the recording apparatus tests the recording conditions in the recording condition test area, and then records information on the disk 100 by adjusting the power of the laser based on the result. When the recording condition is first tested in the recording condition test area, the area cannot be used again and a new area must be used for the test, so that the predetermined information is recorded in the update area B, which is consistent with the above description.

The recording device records the user data by the interval ① and then returns to the first part of the interval ① to check whether the data is recorded correctly or whether a defect has occurred. If a part where a defect occurs is found, the part is designated as a defect area. Thus, defect # 1, which is a defect area, is designated. The recording apparatus also records the data recorded in the defect # 1 again in the spare area. The part where the data recorded in the defect # 1 is rewritten is called replacement # 1. Next, the recording apparatus records the user data for the interval ② and then returns to the first part of the interval ② again to check whether the data is properly recorded or whether a defect has occurred. If a defective part is found, that part is designated as defect # 2. In a similar manner, replacement # 2 corresponding to defect # 2 is generated. In addition, defect # 3 and replacement # 3, which are defective areas, are generated in the section ③. In section ④, no part where a defect occurred is found and there is no defect area.

After recording and verifying up to section ④, when the end of recording operation # 1 is predicted (when the user presses the eject button or the recording of the user data assigned to the recording operation is completed), the recording apparatus is the temporary defect information # 1 as the section ① to Information about defects # 1, # 2, and # 3, which are defect areas generated in step 4, is recorded in the temporary defect management area. In addition, management information for managing the temporary defect information # 1 is recorded in the temporary defect management area as the temporary defect management information # 1. On the other hand, positional information indicating the portion allocated for the next test in the recording condition test area is recorded.

When the disc 100 is loaded again, recording operation # 2 is started, the recording condition is tested in the recording condition test area, and data is recorded based on the result. That is, in the recording operation # 2, data is recorded in the same manner as in the case of the recording operation # 1 described above until the sections ⑤ to ⑦, and defects # 4, # 5 and replacements # 4, # 5 are generated. When the recording operation # 2 ends, the recording apparatus records the information regarding the defects # 4 and # 5 as the temporary defect information # 2. Furthermore, the defect management information # 2 for managing the temporary defect information # 2 is recorded in the temporary defect management area. On the other hand, positional information indicating the portion allocated for the next test in the recording condition test area is recorded. When the recording operation is performed a predetermined number of times in this manner, the last temporary management information recorded in the temporary defect management area, that is, the position information indicating the location of the defect information and the location of the defect management information, is recorded in the access information area and the recording condition is recorded. Location information indicating the portion allocated for the next test in the test area is recorded.

Looking at the improvement of the access time to the disk 100 according to the present invention is as follows.

When ECC correction is performed in units of blocks and the reproduction time of one block is called '1'. Recording is done in blocks that are ECC correction units. If the amount of information to be updated exceeds one block as a result of performing one recording operation on the update area A, update area B, update area C, that is, three update areas, the effect of the access information area is further increased. This is because if the amount of information to be updated is always recorded within one block, the number of times of performing the recording operation and the number of used blocks become the same, so that the location where the update information is recorded can be predicted. Therefore, as a result of performing one recording operation, the amount of information to be updated is within one block, and the size of each update area is as follows, and is updated each time the following number of recording operations are performed.

Update area A: 1000 blocks, the number of recording operations being updated = a,

Update area B: 1000 blocks, the number of updated recording operations = b,

Update area C: 1000 blocks, the number of recording operations updated = c,

Update time of access information area: a + b + c = 30.

Under the above conditions, the time required to obtain the latest information of each of the update area A, update area B, and update area C is compared with the case where the access information area is present or not.

If there is an access information field: (a + b + c) / 30 + (a + b + c)% 30. (Where% means modular operation)

If there is no access information field: a + b + c.

In conclusion, when the access information area is provided, the same time until the recording operation is performed 30 times, but when the recording operation exceeds 30 times, it is possible to reduce the time to play 29 blocks every 30 additional recording operations. If the recording operation performed on an update area is 299, the time required to reproduce 9 * 29-1 = 260 blocks can be reduced. That is, when there is no access information area, it takes time to play 299 blocks until accessing the update area and scanning and obtaining new information. However, when there is an access information area, only time for playing 39 blocks is needed. You can get the latest information as quickly as possible.

As described above, according to the present invention, a method of recording information in a data structure that can shorten the access time for reading updated information in the case of a recording disc in which a predetermined information is updated and recorded in a new location, and the disc Is provided.

Claims (27)

In a single recording layer write once disc having a lead-in area, a data area and a lead-out area arranged in this order, At least one update area provided in at least one of the lead-in area, the data area, and the lead-out area, in which predetermined information to be updated is recorded; And And an access information area provided in at least one of the lead-in area and the lead-out area to record position information indicating a position at which the information last updated in the update area is recorded. Write once having a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in order ) Disk, At least one update area provided in at least one of the lead-in area, a data area, a lead-out area, and an outer area so that predetermined information is updated and sequentially recorded; And And an access information area provided in at least one of the lead-in area, the lead-out area, and the outer area, wherein location information indicating a location where the information last updated is recorded in the update area is recorded. Disk. In a single recording layer write once disc having a lead-in area, a data area and a lead-out area arranged in this order, A plurality of update areas provided in at least one of the lead-in area, a data area, and a lead-out area, in which predetermined information is updated and sequentially recorded; And An access information area provided in at least one of the lead-in area and the lead-out area, the location information indicating a location where the information last updated in the update area is recorded; And at least one of the update areas records position information indicating a position at which last updated information is recorded in at least one of the remaining update areas. Write once having a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in order ) Disk, A plurality of update areas provided in at least one of the lead-in area, data area, lead-out area, and outer area, and predetermined information is updated and sequentially recorded; And An access information area provided in at least one of the lead-in area, the lead-out area, and the outer area, the location information indicating a location where the last updated information is recorded in the update area; And at least one of the update areas records position information indicating a position at which last updated information is recorded in at least one of the remaining update areas. The method according to any one of claims 1 to 4, And position information of the access information area is recorded each time a predetermined number of recording operations are completed. The method according to any one of claims 1 to 4, And position information of the access information area is recorded whenever information is filled in a predetermined number of blocks of the update area. The method according to any one of claims 1 to 4, And position information of the access information area is repeatedly recorded a plurality of times. The method according to claim 3 or 4, And the position information of the access information area is recorded when any one of the update areas has been recorded a predetermined number of times. The method according to any one of claims 1 to 4, And the position information of the access information area is recorded if the sum of the number of times that predetermined information is updated in the update area is a predetermined number. A method of shortening the access time to a single recording layer write once disc in which a lead-in area, a data area and a lead-out area are arranged in sequence, the method comprising: (a) sequentially recording predetermined information updated in at least one update area provided in at least one of a lead-in area, a data area, and a lead-out area of the disc; And (c) recording position information indicating a position at which the information last updated in the update area is recorded in the access information area provided in at least one of the lead-in area and the lead-out area at predetermined intervals. Characterized in that the method. A method of shortening the access time to a single recording layer write once disc in which a lead-in area, a data area and a lead-out area are arranged in sequence, the method comprising: (a) sequentially recording predetermined information updated in a plurality of update areas provided in at least one of the lead-in area, data area, and lead-out area; (b) recording location information indicating a location in which at least one piece of updated information is recorded in at least one of the remaining update areas in one of the update areas; And (c) recording position information indicating a position at which the information last updated in the update area is recorded in an access information area provided in at least one of the lead-in area and the lead-out area. How to. Write once having a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in order In a method for shortening the access time to a disk, (a) sequentially recording predetermined information updated in at least one update area provided in at least one of the lead-in area, data area, lead-out area, and outer area; And (c) recording position information indicating a position at which the information last updated in the update area is recorded in an access information area provided in at least one of the lead-in area, the lead-out area, and the outer area. Characterized in that the method. Write once having a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in order In a method for shortening the access time to a disk, (a) sequentially recording predetermined information updated in a plurality of update areas provided in at least one of the lead-in area, the lead-out area, and the outer area; (b) recording location information indicating a location in which at least one piece of updated information is recorded in at least one of the remaining update areas in one of the update areas; And (c) recording position information indicating a position at which the information last updated in the update area is recorded in an access information area provided in at least one of the lead-in area, the lead-out area, and the outer area. Characterized in that the method. The method according to any one of claims 10 to 13, The step (c) is performed every time a predetermined number of recording operations are completed. The method according to any one of claims 10 to 13, The step (c) is executed every time a predetermined number of blocks of the update area are filled. The method according to any one of claims 10 to 13, The step (c) is characterized in that the step of repeatedly recording the position information a plurality of times in the access information area. The method according to claim 12 or 13, The step (c) is performed if any one of the update areas is performed a predetermined number of recording operations. The method according to claim 12 or 13, Step (c) is performed if the sum of the number of times the predetermined information is updated in the update area is a predetermined number. An apparatus for recording information on a single recording layer write once disc in which a lead-in area, a data area and a lead-out area are arranged in sequence, A recording / reading unit which records or reads information on the disc; And Predetermined information to be updated is sequentially recorded in at least one update area provided in at least one of a lead-in area, a data area, and a lead-out area of the disc, and at least one of the lead-in area and the lead-out area. And a control unit for controlling the recording / reading unit to record, at predetermined intervals, position information indicating a position at which the information last updated in the update area is recorded in the access information area provided in the apparatus. An apparatus for recording information on a single recording layer write once disc in which a lead-in area, a data area and a lead-out area are arranged in sequence, A recording / reading unit which records or reads information on the disc; And Predetermined information to be updated in a plurality of update areas provided in at least one of the lead-in area, the data area, and the lead-out area is sequentially recorded, and lastly in at least one of the remaining update areas in any one of the update areas. Location information indicating a location at which the updated information is recorded is recorded, and an access information area provided in at least one of the lead-in area and the lead-out area is notified of a location where the information last updated in the update area is recorded; And a control unit for controlling the recording / reading unit to record the position information. Write once having a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in order A device for recording information on a disc, A recording / reading unit which records or reads information on the disc; And Predetermined information updated in at least one update area provided in at least one of the lead-in area, data area, lead-out area, and outer area is sequentially recorded, and the lead-in area, lead-out area, and outer area are respectively recorded. And a control unit for controlling the recording / reading unit to record location information indicating a location at which information last updated in the update area is recorded in an access information area provided in at least one of the areas. Write once having a first recording layer in which the lead-in area, the data area and the lead-out area are arranged in order, and a second recording layer in which the outer area, the data area and the lead-out area are arranged in order A device for recording information on a disc, A recording / reading unit which records or reads information on the disc; And Predetermined information updated in a plurality of update areas provided in at least one of the lead-in area, data area, lead-out area, and outer area is sequentially recorded, and at least one of the remaining update areas in any one of the update areas. Location information indicating a location at which the last updated information is recorded in the second location information, and information last updated in the update area in an access information area provided in at least one of the lead-in area, the lead-out area, and the outer area And a control unit for controlling the recording / reading unit to record the position information indicating the recorded position. The method according to any one of claims 19 to 22, And the controller controls the recording / reading unit to record the position information in the access information area every time a predetermined number of recording operations are completed. The method according to any one of claims 19 to 22, And the controller controls the recording / reading unit to record the location information in the access information area whenever a predetermined number of blocks of the update area are filled. The method of claim 21 or 22, And the controller controls the recording / reading unit to record updated information in the update area for each recording operation. The method of claim 21 or 22, And the controller controls the recording / reading unit to record the location information in the access information area when any one of the update areas has been recorded a predetermined number of times. The method of claim 21 or 22, And the controller controls the recording / reading unit to record the location information in the access information area when the sum of the number of times that the predetermined information is updated in the update area is predetermined.

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