JP2008159088A - Optical disc apparatus and optical disc recording method - Google Patents

Abstract

An optical disc apparatus capable of performing a highly reliable alternative process by writing defect management information only in a high-quality candidate area having a recording quality equal to or higher than a predetermined value.
A recording unit that records information by irradiating a laser onto an optical disc, a measuring unit that measures a recording quality of a storage area of the optical disc, and a recording quality measured by a measuring unit in the storage area of the optical disc. An optical disc apparatus having control units 11 and 14 for controlling a recording unit to record defect management information in an area of a predetermined value or more.
[Selection] Figure 1

Description

  The present invention relates to an optical disc apparatus and an optical disc recording method for performing substitution processing based on defect management information.

  In recent years, various types of optical discs have been developed, manufactured and spread. In such an optical disk, a defect management information technique for performing reliable information recording processing by detecting a defective storage area in advance, preparing a replacement area, and recording information in the replacement area is known. It has been.

As a technique related to this, Patent Document 1 detects the information indicating the start position of a replacement area currently in use from a DMA (defect management area) manager, and based on the detected information, a plurality of replacement areas are detected. A technique for calculating a capacity ratio of an unused replacement area that is still unused and displaying the calculated capacity ratio of an unused replacement area is disclosed.
JP 2006-209920A.

  However, in the prior art disclosed in Patent Document 1, there is described anything about the process of grasping the recording quality (defect state: PI error state) of the disc before initialization and not recording the defect management information in a place where the recording quality is poor. If the defect management information is recorded in a place with poor recording quality, the defect management information may be damaged.

  An object of the present invention is to provide an optical disc apparatus and an optical disc recording method that enable highly reliable alternative processing by writing defect management information only in a high-quality candidate area in which the recording quality is equal to or higher than a predetermined value. .

One embodiment for solving the problems of the present invention is as follows.
A recording unit (13, 18) for recording information by irradiating an optical disc with a laser;
A measurement unit (20) for measuring the recording quality of the storage area of the optical disc based on a reproduction signal;
A control unit (11, 14) for controlling the recording unit to record defect management information in an area where the recording quality measured by the measuring unit is a predetermined value or more in the storage area of the optical disc;
An optical disc device comprising:

  Since defect management information is recorded in a high-quality candidate area in which the recording quality is equal to or higher than a predetermined value when the disc is formatted, an alternative process using highly reliable defect management information is possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing an example of the configuration of an optical disc apparatus according to an embodiment of the present invention.

<Optical Disc Device According to an Embodiment of the Present Invention>
(Constitution)
As shown in FIG. 1, an optical disc apparatus 10 according to an embodiment of the present invention includes a CPU 11 that controls the entire control, a video data input unit 12 that is connected to the CPU 11 via a cable and inputs video data to the apparatus, Video data input unit 12-2 for outputting video data to the outside from the apparatus, file system unit 13 for writing / reading video data and management data as a file, and recording medium defects under control of the file system unit 13 It has a defect management unit 14 that performs management on the host side.

  Further, the optical disc apparatus 10 has a drive unit 17 as shown in FIG. 1, and the drive unit 17 has a header driver unit 18 having a writing function for recording data on the optical disc D and a reading function for reading data from a recording medium. As a method for measuring the recording quality of the optical disc D and the header part 19 controlled by this, PI errors are measured and stored in a table as necessary. In response to an inquiry about the number of PI errors at a specified location A PI error measurement unit 20 that returns the value.

(Defect management information recording process)
Next, a defect management information recording process which is an embodiment of the optical disc apparatus 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 2 is a flowchart showing an example of defect management information recording processing at the time of initialization of the optical disc apparatus according to the embodiment of the present invention. Note that each step in the flowchart of FIG. 2 below can be replaced with a circuit block, and therefore each step of the flowchart of FIG. 2 can be redefined as a block.

  First, as shown in the flowchart of FIG. 2, the optical disc apparatus 10 according to the present invention formats the recording area by the operation of the CPU 11 and the initialization unit 15, and also manages volume management information and partition management other than defect management information. Information or the like is recorded in the recording area 101 (step S11). Here, the area 103 of the optical disc D is an area in which general content information and the like are recorded. Next, the defect management unit 14 determines whether or not there is a region candidate for recording defect management information. If there is a region candidate (step S12), the defect management unit 14 sets the region candidate measured by the PI error measurement unit 20 as the region candidate. The number of corresponding PI errors is acquired, and it is determined whether or not this is below a predetermined value (which may be set by the user or the designer) (step S14).

  If the number of PI errors in the area candidate is equal to or smaller than the predetermined value, the defect management unit 14 determines the area candidate as a defect management area (step S17) and records defect management information in this area candidate (step S18).

  However, if the number of PI errors of the area candidate is not less than the predetermined value in step S14, the target is moved to the next area candidate (step S15), and it is confirmed again as a defect management area candidate (step S14). S12) The processing in step S13 and the determination in step S14 are repeated until the number of corresponding PI errors becomes equal to or less than a threshold value (predetermined number), thereby determining a defect management area.

  However, if the number of PI errors does not fall below the threshold (predetermined number) until the last region candidate and there are no region candidates (step S12), it is also preferable to stop the initialization.

  It is also preferable to select the area with the smallest number of PI errors from the area candidates that have not been adopted as the defect management area so far as the area where the defect management information is to be recorded (step S16). Thereafter, the selected defect management area is determined as an area for recording defect management information (step S17), and defect management information is recorded (step S18).

-Example of defect management information Here, an example of defect management information is demonstrated using FIG. FIG. 3 is a diagram for explaining defect management information at the time of initialization and candidates for its recording location. In FIG. 3, in the volume area 101 of the management area of the optical disc D, four defect management area candidates 102 are prepared as one piece of volume information.

  In FIG. 3, the initial state of the defect management information K is recorded in the second candidate location according to the procedure shown in the flowchart of FIG. The defect management information K includes an alternative location B and a defect management table T that associates recording locations with alternative locations. In this example, the defect management table T and the alternative location B are written adjacent to each other, but it is also preferable that the defect management table candidate and the alternative location B candidate do not exist in consecutive locations.

(Alternative processing using defect management information)
Next, a defect management information recording process which is an embodiment of the optical disc apparatus 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 4 is an explanatory diagram showing an example of an alternative process using defect management information in the optical disc apparatus according to the embodiment of the present invention.

  Here, in the optical disc apparatus 10 according to an embodiment of the present invention, as shown in FIG. 4, in the management of the file system unit 13, when information is recorded in the area A, the defect management unit 14 detects defects in the defect management information. It is confirmed whether or not the area A is registered in the management table T. If not registered, recording is performed directly on the area A.

  However, if the area A is registered in the defect management table of the defect management information, recording is attempted to the replacement destination, here the replacement destination C2. However, if the replacement destination C2 has many defects, the result is NG, and then the replacement destination C3 is selected. If the replacement destination C3 also has many defects, it becomes NG again and is recorded in the replacement destination C4. As described above, if there are many PI errors in the defect management information itself, replacement may occur many times and recording may take time.

  Such repetition of substitution processing can be avoided by selecting a defect management area with a small PI error.

  As described above in detail, in one embodiment according to the present invention, in recording defect management information at the time of formatting, a defect (PI error) state of a disk is investigated in advance, and a PI error is detected. Avoid creating defect management areas in high places. As a result, problems such as failure in defect registration when there are many PI errors in the defect management area and failure to read the defect management information can be solved, and operational reliability can be ensured.

  With the various embodiments described above, those skilled in the art can realize the present invention. However, it is easy for those skilled in the art to come up with various modifications of these embodiments, and have the inventive ability. It is possible to apply to various embodiments at least. Therefore, the present invention covers a wide range consistent with the disclosed principle and novel features, and is not limited to the above-described embodiments.

1 is a block diagram showing an example of the configuration of an optical disc device according to an embodiment of the present invention. 6 is a flowchart showing an example of defect management information recording processing of the optical disc apparatus according to an embodiment of the present invention. Explanatory drawing which shows an example of the defect management information which the optical disc device concerning one Embodiment of this invention handles. Explanatory drawing which shows an example of the alternative process using the defect management information in the optical disc apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

  D ... Optical disc, 11 ... CPU, 12 ... Video data input unit, 12-2 ... Video data output unit, 13 ... File system unit, 14 ... Defect management unit, 15 ... Initialization unit, 17 ... Drive unit, 18 ... Header Driver part, 19 ... header part, 20 ... PI error measurement part.

Claims (8)

A recording unit that records information by irradiating a laser onto an optical disc;
A measuring unit for measuring the recording quality of the storage area of the optical disc based on a reproduction signal;
A control unit for controlling the recording unit to record defect management information in an area where the recording quality measured by the measuring unit is a predetermined value or more in the storage area of the optical disc;
An optical disc apparatus comprising:   2. The optical disc apparatus according to claim 1, wherein the control unit records the defect management information when initializing the optical disc.   Of the storage areas of the optical disc, when the recording quality of all the area candidates of the defect management information is not more than a predetermined value, the defect management information is recorded in the area having the highest recording quality from all the area candidates. 2. The optical disk apparatus according to claim 1, wherein   When recording information in a predetermined area of the storage area of the optical disc, the control unit refers to the defect management information and indicates a replacement destination of the predetermined area if the replacement destination of the predetermined area is indicated. 2. The optical disc apparatus according to claim 1, wherein the information is recorded in an area. Measure the recording quality of the storage area of the optical disc based on the playback signal,
An optical disk recording method comprising: recording defect management information, which is substitute information for a recording area, in an area where the recording quality is a predetermined value or more in a storage area of the optical disk.   6. The optical disc recording method according to claim 5, wherein the defect management information is recorded when the optical disc is initialized.   Of the storage areas of the optical disc, when the recording quality of all the area candidates of the defect management information is less than or equal to a predetermined value, defect management information is assigned to the area with the highest recording quality from all the area candidates. 6. The optical disk recording method according to claim 5, wherein recording is performed.   When recording information in a predetermined area of the storage area of the optical disc, if the replacement destination of the predetermined area is indicated with reference to the defect management information, the information is stored in the storage area of the replacement area of the predetermined area. 6. The optical disk recording method according to claim 5, wherein recording is performed.

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