JP3552223B2 - Optical recording method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical recording method for performing recording on an optical recording medium by irradiating light according to recording information.
[0002]
[Prior art]
Most optical recording media currently used in practice, such as optical disks and magneto-optical disks, guarantee the number of repetitive recordings of 100,000 to 10,000,000 times or more (for example, 1 billion times). With the increase in density as in the case of the magneto-optical disk described above, it has become difficult to guarantee the same number of repetitions as in the past with the current structure of the recording film. It has also been reported that the number of repetitive recordings of a phase change type disk has been improved, and a characteristic of 100,000 times or more has been obtained. Not guaranteed.
[0003]
By the way, a recording medium for a computer needs to guarantee a sufficient number of repetitive recordings. However, in a recording medium for an audio-video or the like, a usage form in which only a partial area is rather intensively rewritten is generally used. is there. For example, when used for editing, the main audio data is hardly rewritten, and the sub data is rewritten many times during editing. In some systems, the date and time of the last access is updated each time, and the number of times of rewriting of a specific area (for example, a specific sector) naturally increases. In this case, the sector that is frequently rewritten is a part in which a file structure is described or a sector in which a disk structure management table called a so-called DDS (Disk Definition Structure) is recorded.
[0004]
Conventionally, if the recording characteristics have been degraded due to such high-frequency data rewriting, the data may not be able to be read. Therefore, such a portion (defective sector) is replaced by performing a replacement process. Data is transferred to a sector to prevent the medium from becoming inaccessible.
[0005]
[Problems to be solved by the invention]
However, such a replacement process is performed only for the user area, and the replacement process is performed on the portion where the above file structure is described. No replacement process is performed, and in the worst case, the reproduction of the disc becomes impossible.
[0006]
The present invention has been made in view of such a problem, and an object of the present invention is to provide an optical recording method capable of sufficiently guaranteeing a substantial number of repeated recordings in an optical disk system.
[0007]
[Means for Solving the Problems]
The optical recording method of the present invention performs recording on an optical recording medium by irradiating light according to recording information, and recording a defect management table for managing a defect location of the optical recording medium in a defect management area on the optical recording medium. An optical recording method for recording a disk structure management table including a defect management table recording address indicating a position, wherein when a defect occurs in a recording area itself of the defect management table, the defect management table is replaced with a predetermined replacement area. In addition to performing the defect replacement process, the defect management table recording address in the disk structure management table is rewritten, and each time the defect management table recording address in the disk structure management table is rewritten a predetermined number of times, the disk structure management is performed. Table with additionally written in the new area in the defect management area, also rewrites the contents of the disk structure management table of the disk structure management table and added position of the original position, the most recent Always defect management table for which rewrite times are different from each other a plurality of disk structure management table is present in a plurality of different positions, it was additionally written to the newest area among the plurality of disk structure management table which has an content Multiple recording is performed such that rewriting of a recording address does not exceed a predetermined number of times .
[0008]
In this optical recording method, each time the disc structure management table is rewritten a predetermined number of times (specifically, the defect management table recording address is rewritten), the disc structure management table is rewritten to a new area in the defect management area on the optical recording medium. A management table is recorded. In particular, in this optical recording method, the disk structure management table of the previous position (original position and additional positions) is rewritten, new area of the disk structure management table in the defect management area of the same content Is added to
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
FIG. 1 shows a recording format of an optical disk to which an optical recording method according to an embodiment of the present invention is applied. Here, a case where the recording method of the present invention is applied to “130 mm rewritable optical disk cartridge X 6271” specified by JIS will be described.
[0011]
In this format, the optical disc is configured so that the track number increases from the inner side (the innermost radius of 27 mm) to the outer side (the outermost radius of 61 mm), and has a mirror-finished mirror surface area and a PEP ( Phase Encoded Part). ) Area, a transition area where nothing is written, two SFP (Standard Formatted Part) areas, two manufacturer areas, a user zone, and a lead-out area. The PEP area is an area in which the characteristics (modulation method, the number of sectors per track, etc.) of the optical disk are recorded, and the SFP area is an area in which more detailed disk information (recording power, etc.) is recorded than the PEP area. The manufacturer area is an area used for quality control such as checking an error rate by writing and reading a test pattern in a manufacturing stage. The user zone is arranged in an area from track numbers "0" to "N", and includes a defect management area (hereinafter, referred to as a DMA (Defective Management Area)) arranged in three tracks before and after the area. And a sandwiched user area.
[0012]
On the optical disk having such a format, the drive side first reads information in the PEP area and information in the SFP area, sets recording conditions such as recording power based on the information, and performs recording. I have.
[0013]
In the case of the format of 1024 bytes per sector, one track is composed of 17 sectors, and in the case of the format of 512 bytes per sector, one track is composed of 31 sectors. In this example, 1024 bytes / sector is used. The case will be described.
[0014]
FIG. 2 shows the internal structure of the DMA in FIG. 1 in more detail. As shown in this figure, two DMA1 and DMA2, each having a size of 25 sectors, are arranged on three tracks from track "0" to track "2". Among them, DMA1 is arranged in track “0” sector “0” to track “1” sector “7”, and DMA2 is arranged in track “1” sector “8” to track “2” sector “15”. ing. On three tracks from track “N−2” to track “N”, two DMAs 3 and 4 each having a size of 25 sectors are arranged. Among them, DMA3 is arranged in track "N-2" sector "0" to track "N-1" sector "7", and DMA4 is arranged in track "N-1" sector "8" to track "N" sector. It is arranged at “15”. The same contents are recorded in all of the DMAs 1 to 4. Note that track 2 sector "16" and track "N" sector "16" are spare sectors and are not used.
[0015]
First, regarding the DMA1, a disk structure management table (hereinafter, referred to as DDS) is arranged in the first sector (track "0", sector "0") of the DMA1, and the next sector (track "0", sector "0"). 1 "), a primary defect management table (hereinafter, referred to as PDL (Preliminary Defect List)) is arranged. In the 9 sectors from the next sector (track “0”, sector “2”) to sector “10” of the same track, a secondary defect management table (hereinafter, referred to as SDL (Secondary Defect List)) is arranged. . Further, a 14-sector area (track “0”, sector “11” to track “1”, sector “7”) subsequent thereto is a DDS multiplex writing area, that is, a track “0” sector “0” as described later. DDSs having the same contents as the DDSs are multiplexed in a positional manner (repeated at different locations) and used as an area to be recorded. When initialization without verification is performed (described later), if PDL does not exist, SDL is arranged next to DDS. The other sectors 2 to 4 have the same sector allocation.
[0016]
The above description has been given of the case of the format of 1024 bytes / sector. In the case of 512 cases / sector, the DMA has a configuration as shown in FIG. 6, for example. That is, one sector is allocated to each of the DDS and PDL, but 17 sectors are allocated to the SDL and 27 sectors are allocated to the DDS multiplex writing area.
[0017]
Here, such an optical disk initialization and defect management method will be described.
[0018]
Each side of the optical disk must be initialized before use by the user. The initialization includes initialization with verification of a defective portion (sector where data cannot be read) and initialization without verification of the defective portion.
[0019]
When the initialization with the verification of the defective portion is performed, the found defective sector is processed by the sector slip method (a method of replacing the defective sector with the first normal sector following the defective sector), and the address of the defective sector is set to PDL. (Described later in FIG. 4) are registered in ascending order. As a result of the verification, normal sectors in the user zone (tracks “3” to “N−3”) are divided into g groups of the same size. Each group is composed of n data sectors and m spare sectors. g, n and m are values determined by the user so as to satisfy the following equations (1) and (2), and are registered in the DDS as described later.
g ≦ 2048 (1)
g × (m + n) ≦ 17 × (N−5) −2048 (2)
However, in the case of the format of 512 bytes / sector, the following equation (3) is used instead of equation (2).
g × (m + n) ≦ 31 × (N−5) −2048 (3)
[0020]
When initialization without verification of a defective portion is performed, the found defective sector is processed by the sector slip method and is replaced with the first normal sector following the defective sector. However, as described above, the PDL is created. Instead, g, m, and n determined to satisfy the above equations (1) and (2) are registered in the DDS.
[0021]
Next, an outline of a recording method for this optical disc will be described.
[0022]
When data is recorded in each sector, all defective sectors recorded in the PDL are skipped, and recording is performed in the succeeding sector . Defective sectors found after initialization are processed by the linear replacement method. That is, when a defective sector is found, the defective sector is recorded again in the first available spare sector in the group. If there is no available spare sector in the group, rewrite to the available spare sector in the closest group. If there is a defect in the replacement sector, it is rewritten to the next available spare sector. Then, the addresses of the defective sector and the replacement sector are registered in the SDL. Note that the number of defective sectors registered in the PDL and SDL (that is, the number of defective sectors that can be replaced on one side of the optical disk) is 2048 at the maximum.
[0023]
Note that PDL and SDL of the DMA are rewritten to the replacement sector by normal replacement processing, but such replacement processing is not performed for DDS, and instead, a predetermined format which is a feature of the present invention is used. Multiple recording (positional multiple rewriting to the DDS multiplex writing area) is performed for each rewriting number.
[0024]
FIG. 3 shows a byte configuration of the DDS. As shown in this figure, the DDS is composed of 22 bytes, of which data indicating that this table is a DDS is written in bytes “0” and “1”, and the presence of PDL is written in byte “3”. Is written to indicate the presence or absence of. In bytes "4" to "13", the number g of the groups, the number n of the user data sectors per group, and the number m of the primary spare sectors per group are written. Furthermore, the PDL start address (track number) is written in bytes "14" to "17", and the SDL start address (track number) is written in bytes "18" to "21". .
[0025]
FIG. 4 shows a byte configuration of the PDL. As shown in the figure, data indicating that this table is a PDL is written in the byte “1” of the PDL, and the number of registered defective sectors is written in the bytes “2” to “3”. It is to be written. In bytes "4" to "7", the address (track number) of the first defective sector found in the initialization is recorded. Similarly, the addresses of the second and subsequent defective sectors are recorded using four bytes. Usually, the number of defective sectors found by initialization is 100 or less, so that if one sector is used, all PDLs can be recorded.
[0026]
FIG. 5 shows the byte configuration of the SDL. As shown in this figure, data indicating that this table is SDL is written in byte “1” of SDL, and the length (byte “byte”) of this SDL is written in bytes “4” to “5”. 6 "). The address (sector number) of the first defective sector is recorded in byte “7”, and the sublist length of this SDL (the number of bytes after byte “10”) is written in bytes “8” to “9”. It is supposed to be. In bytes “10” to “13”, the address (track number) of the first defective sector found after initialization is recorded. Similarly, the addresses of the second and subsequent defective sectors are recorded using 8 bytes. Normally, the number of defective sectors that can be found and registered after initialization is 1024 at the maximum, so that if there are 9 sectors, all SDLs can be recorded.
[0027]
Next, a description will be given of a processing procedure when the recording method of the present invention is applied to an optical disk having the above-described format configuration.
[0028]
Initially, as shown in FIG. 2, the DDS is composed of track "0" sector "0", track "1" sector "8", track "N-2" sector "0", and track "N-1" sector "8". "Are recorded with the same contents in four places. The DDS includes the start track number of the SDL as shown in FIG. Therefore, when the SDL is rewritten to the replacement sector by the normal replacement process, the contents of the DDS (bytes “18” to “21”) are also rewritten.
[0029]
In the present embodiment, the number of rewrites of the DDS is recorded using two bytes (for example, bytes “22” and “23” in FIG. 3) of an unused area in the DDS. Then, the drive reads the rewrite count data before rewriting the DDS, and when the drive count exceeds a predetermined count (for example, 1000 or 10,000 times), the drive returns to the original position (track “0”, sector “0”). And the DDS having the same contents is also recorded in the first sector ("0" sector "11") of the DDS multiplex writing area (FIG. 2) of DMA1-4. In the subsequent rewriting, both the sector at the original position and the DDS of the sector at the added position are to be rewritten. Similarly, every time the number of times exceeds a predetermined number, the DDS of the sector at the original position and the sector at the added position are rewritten, and the DDS is added to a new sector in the DDS multiplex writing area. For example, if such a process is performed every 1000 times, the DDS is recorded at 10 locations at the 9001 time.
[0030]
The process of reading the contents of the DDS from such an optical disc is performed, for example, as follows. First, the DDS at the initial position (track “0”, sector “0”) is accessed, and if this can be read, the data is adopted as the contents of the DDS. When reading cannot be performed from the initial position, the DDS of the first sector in the DDS multiplex writing area is accessed. When this cannot be read, the DDS of the next sector is accessed. Hereinafter, the same processing is performed.
[0031]
In the conventional method, the DDS is multiplexed and recorded at the above four locations. However, since these four DDSs are rewritten in parallel, the degradation of the signal quality proceeds almost equally. At a certain point in time, there is a possibility that all four locations will be in a read disabled state at once.
[0032]
On the other hand, in the present embodiment, in each of the four DMAs, multiplex recording is performed in which the recording position is increased with a time difference (every predetermined number of rewrites) in the DDS. In the newest sector among the plurality of sectors in which the same DDS is recorded, at most, only the rewriting of the predetermined number of times or less (for example, 1000 times) or less is performed, and signal quality is hardly degraded. Therefore, it is possible to reduce the possibility of being unable to read, and to prolong the life of the optical disc. Specifically, in the example of FIG. 2, since the size of the DDS multiplex writing area is 14 sectors, multiplexing (expansion) performed every predetermined number of times can be at least estimated at least 10 times. 10 times the reliability of
[0033]
As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to this embodiment, and can be variously modified within an equivalent range. For example, instead of multiplex-recording the DDS in the DDS multiplex writing area as in the above embodiment, the DDS recording location in the DDS multiplex writing area is sequentially moved to a new sector every predetermined number of rewrites. At the same time, after the movement, it may be configured not to overwrite the previous sector. However, as in the above embodiment, it is better to overwrite the previous sector, even if the latest sector becomes unreadable, the DDS of the previous sector is read. This is advantageous in securing reliability because there is a possibility that the operation can be performed.
[0034]
Further, in the present embodiment, the description has been made with reference to the “130 mm rewritable optical disk cartridge X 6271” specified by JIS, but the present invention is not limited to this, and optical disks of other standards are also applicable. Applicable. Further, the present invention is applicable not only to a magneto-optical recording medium but also to a phase-change type medium or another optical recording medium.
[0035]
【The invention's effect】
As described above, according to the optical recording method of the present invention, each time the disc structure management table is rewritten a predetermined number of times, the disc structure management table is added to a new area in the defect management area on the optical recording medium. This prevents the disk structure management table from being rewritten a predetermined number of times at the same position. For this reason, even in the case of a disk structure management table that has not been subjected to normal defect replacement processing than before, it is possible to rewrite the number of times significantly exceeding the rewriting performance (maximum number of repetitive recordings) of the recording film. Thus, it is possible to extend the life of the optical disk and improve the data reliability.
[0036]
In particular, according to the optical recording method of the present invention, rewriting with additionally writes the disk structure management table to a new area, the same contents also disk structure management table of the previous position (original position and additional positions) Therefore, even if the disk structure management table recorded in the latest area becomes unreadable, it is possible to read the disk structure management table at the previous position. As the rewriting progresses, multiplexing progresses, and there are a plurality of disk structure management tables having the same latest contents in many areas and different numbers of rewrites from each other, and writing is performed in the latest area of the plurality of disk structure management tables. Since the rewriting of the defect management table recording address does not exceed a predetermined number of times for the added one, it is more advantageous in securing the reliability.

[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating a recording format example of an optical disc to which an optical recording method according to an embodiment of the present invention is applied.
FIG. 2 is an explanatory diagram illustrating an internal configuration of a defect management area (DMA).
FIG. 3 is an explanatory diagram showing a configuration of a disk structure management table (DDS).
FIG. 4 is an explanatory diagram showing a configuration of a primary defect management table (PDL).
FIG. 5 is an explanatory diagram showing a configuration of a secondary defect management table (SDL).
FIG. 6 is an explanatory diagram showing another example of a recording format of an optical disc to which the optical recording method according to one embodiment of the present invention is applied.
[Explanation of symbols]
DMA1 to DMA4: defect management area, 11: DDS (disk structure management table), 12: PDL (primary defect management table), 13: SDL (secondary defect management table), 14: DDS multiplexed area

Claims (1)

The recording is performed on the optical recording medium by irradiating light according to the recording information, and a defect management table recording address indicating a recording position of a defect management table for managing a defect location of the optical recording medium in a defect management area on the optical recording medium. An optical recording method for recording a disk structure management table including
When a defect occurs in the recording area itself of the defect management table, a defect replacement process for rewriting the defect management table to a predetermined alternative area is performed, and the recording address of the defect management table in the disk structure management table is rewritten. ,
Each time the rewriting of the defect management table recording address in the disk structure management table exceeds a predetermined number of times, the disk structure management table is added to a new area in the defect management area, and the disk structure at the original position is written. Rewrite the contents of the management table and the disk structure management table at the added position,
A plurality of disk structure management tables having the same latest contents and different numbers of rewrites are present at a plurality of different positions, and among the plurality of disk structure management tables, the one written in the newest area is always the same as described above. An optical recording method, wherein multiplex recording is performed such that rewriting of a defect management table recording address does not exceed a predetermined number of times .

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