KR20010090966A - Method of verifying defect management area information of optical disc upon initialization with certification and test apparatus for performing the same - Google Patents

Abstract

PURPOSE: A method for identifying defect management area information of an optical disc upon initialization with certification and a test apparatus for performing the same are provided to identify whether defect management area information is exactly generated during initialization with certification. CONSTITUTION: A test type disc(11) is a disc having only known physical defects on a predetermined position of a blank disc. A drive(110) to be tested performs initialization with certification with respect to the test type disc(11) to generate DMA information and record the generated DMA information on the test type disc(11). An initialized test type disc(12) without certification provided from the drive(110) is mounted on a modified drive(120) which can read the DMA information. The modified drive(120) is called as a reference drive which is a test-only drive manufactured by a manufacturer. The modified drive(120) reads only the DMA information recorded on the initialized test type disc(12) with certification and generates a DMA mirror file(13) for the initialized test type disc with certification on a file system.

Description

Method of verifying defect management area information of optical disc upon initialization with certification and test apparatus for performing the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of recording / reproducing optical discs, and more particularly, to a method for confirming defect management area information of an optical disc capable of recording / reproducing at initialization with verification and a test apparatus for performing the same.

Digital Versatile Disc Random Access Memory (DVD-RAM) discs have a function to replace defects on a disc with a normal recording area. Such a function is referred to as defect management, and information necessary for defect management is provided in a defect management area (e.g., It is stored in a place called Defect Management Area (DMA). In the DMA, four pieces of information are repeatedly recorded at two positions in the lead-in area and the lead-out area on the disk. The DMA information is further divided into a Disc Defintion Structure (DDS), a Primary Defect List (PDL), and a Secondary Defect List (SDL).

This DMA information includes not only information about defects detected during initialization or use of the disk, but also information on free space and the start logical sector number for each zone. It contains important information.

The information contained in the DMA can be read and used immediately, but it also includes information that changes depending on the location and number of defects on the disk. This information is based on complex calculations based on algorithms based on the defect information registered in the DMA. There are also things that can be obtained. This corresponds to the starting logical sector number or location information of the first logical sector number of each region.

Such DMA information is closely related to the physical recording position of the data, so that a disc recorded by creating or updating DMA information in one recording / reproducing apparatus can be used in another recording / reproducing apparatus. Similarly, in the case of a removable recording medium, a problem of compatibility between recording / reproducing apparatuses occurs when DMA information is wrong. In order to solve this problem, there is a need for a means and method for confirming that the recording / reproducing apparatus correctly decodes the DMA information from the disc and accurately records the DMA information on the disc.

It is therefore an object of the present invention to provide a method for confirming that defect management area (DMA) information is correctly generated at initialization with verification through an optical disc recording / reproducing apparatus.

Another object of the present invention is to provide a method for confirming that DMA information is correctly generated upon initialization with a DVD-RAM recording / reproducing apparatus capable of repeating recording / playback a plurality of times.

It is still another object of the present invention to provide a test apparatus for confirming that DMA information is generated correctly at initialization with verification through an optical disk recording / reproducing apparatus.

In order to achieve the above objects, the confirmation method according to the present invention is a method for confirming whether or not DMA information is properly generated in a recording / reproducing apparatus for recording / reproducing an optical disk having defect management area (DMA) information: blank After performing initialization with verification using a test disk having a known physical defect on the disk, generating the generated defect management information as test information and verifying the test information using the reference test information for initialization with verification. To provide test results.

In addition, the test apparatus according to the present invention is capable of recording / reproducing, and in an apparatus for testing whether or not DMA information is properly generated in a recording / reproducing apparatus for recording / reproducing an optical disk having defect management area (DMA) information: The verification drive device and the test information having the verification and the retrofitting drive device for generating the DMA information generated from the test disc as test information after performing initialization with verification in a recording / reproducing apparatus using a test disc having a known physical defect on the blank disc. It includes a checker to check the test result by checking using the reference test information for initialization.

1 is a block diagram of a test apparatus for performing an optical disc defect management area information verification method at initialization with verification according to the present invention.

2 is a table summarizing check items for confirming the DMA structure at initialization with verification.

3 is a table summarizing check items for confirming the DDS structure upon initialization with verification.

4 is a table summarizing check items for confirming a PDL structure at initialization with verification.

5 is a table summarizing check items for confirming the SDL structure upon initialization with verification.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of a method for confirming the defect management area information of an optical disk at the time of initialization with verification according to the present invention and a test apparatus for performing the same.

The optical disk used in the present invention is for a DVD-RAM of a phase change recording method having a capacity of 4.7 GB (Giga Bytes). DVD-RAM refers to a disc defined in the DVD specification for Rewritable disc version 2.0.

1 is a block diagram of a test apparatus for performing a method for confirming defect management area information of an optical disc at initialization with verification according to the present invention.

The test disc (hereinafter referred to as C-1 disc: 11) is a disc having only physical defects knowingly in a predetermined position on the blank disc. The drive to be tested 110 performs initialization with certification on the C-1 disk 11 to generate DMA information, and generates DMA information on the C-1 disk 11. Record it. The initialized C-1 disk 12 with the verification provided from the drive 110 to be tested is mounted in a modified drive 120 capable of reading DMA information.

Retrofit drive 120 may be referred to as a reference drive as a test only drive manufactured by a manufacturer. The retrofit drive 120 reads only the DMA information recorded on the C-1 disk 12 initialized with verification and reads the DMA information read on the file system and initializes the DMA mirror for the C-1 disk initialized. Create as a file (Mirror file: 13). In addition, the drive 110 to be tested is, for example, a DVD-RAM recording / reproducing apparatus, and cannot generate DMA information into a mirror file.

The recording / reproducing system of the DVD-RAM recording / reproducing apparatus may include a file system layer, a host interface layer connecting the host computer and the recording / reproducing apparatus, a physical drive layer for recording / reproducing a physical signal, and When divided into recording media layers, etc., recording and decryption of DMA information are performed because the physical sector number of the disk is assigned by the recording medium and the physical drive, and the logical sector number of the disk is assigned by the host interface and file system. Is done below the physical drive hierarchy.

In general, in the case of recording data on a recording medium through a computer, a position to record is determined by using a logical sector number through a file system. The location of the file determined by the logical sector number is logical relative position information, and the process of converting the physical sector number to actual physical data to be recorded in accordance with the physical condition of the disk such as a defect when performing a write operation on the drive. This is necessary. However, when recording user data in an actual file system, only the logical sector number is used to transfer user data to the recording / reproducing apparatus, and the recording / reproducing apparatus transmits the logical sector number to the physical sector number where the actual data should be recorded. The defect management information is used during the conversion. Therefore, when the defect management information is incorrectly read or incorrectly recorded by one recording / reproducing apparatus, there is a problem that the correct data cannot be read or written by the other recording / reproducing apparatus.

In addition, for DVD-RAM discs, all defect management is handled by the drive, so the file system or host interface can record / play back files without knowing this physical defect management, so most drives write to the defect management area. Not only is it impossible to reproduce, but there is no standard command for recording / reproducing in this defect management area. However, in order to determine whether the information in the defect management area is properly formed, it is necessary to make the data readable in a computer that can analyze it in any form, and in order to make a standard test disc, information appropriate for the defect management area is required. Should be able to record To do this effectively, the retrofit drive is adapted to record / reproduce information in the defect management area. The design or modification of such a retrofit drive is easily described by those skilled in the art, and thus the description thereof is omitted.

Verifier 130 is pre-stored with the DMA mirror file 13 for the C-1 disc created and initialized with the verification generated on the drive 110 to be tested and read by the retrofit drive 120 Although not shown in the drawing, a test result of comparing the reference DMA mirror file for the C-1 disk 11 provided from the outside (controller for generating a DMA mirror file) with the verification of whether the DMA information according to the initialization with verification is properly generated. Notify the manufacturer / user. Here, the DMA mirror file may be referred to as test information, and the reference DMA mirror file may be referred to as predetermined test information. In addition, the reference DMA mirror file may be referred to as a DMA information file having data under ideal conditions that do not have any errors that can be produced when the drive normally performs all operations.

The verification method according to the present invention performs an initialization with verification using a test disk having a known physical defect on a blank disk, and then generates generated DMA information as test information and for initialization with test information for verification. The test items of the DMA information to be verified at initialization with verification, including providing the test result by checking using the reference test information, will be described with reference to FIGS. 2 to 5.

First, check items for confirming the DMA structure include an error state of the DMA, a DDS / PDL, an SDL revision counter, and a DMA content as shown in FIG.

The DMA error status item checks whether an error exists in the DMA existing in the lead-in area and the lead-out area, respectively. The errors are not corrected in the four DMA1, DMA2, DMA3, and DMA4. If no errors are found in any of the DMAs, this check is unsuccessful and the test must be retried using a new test disk.

At initialization with verification, the value of M representing the DDS / PDL revision counter values in four DDS1, DDS2, DDS3 and DDS4 and the DDS / PDL revision counter values in four SDL1, SDL2, SDL3 and SDL4 is "0". It is checked whether the value of k indicating acknowledgment and the increment of the counter is "1", and whether all eight values of the DDS / PDL revision counters are equal.

Here, the DDS / PDL revision counter value indicates the total number of revision and rewrite operations for the DDS / PDL block, and should be set to "0" at the beginning of initialization, when the DDS / PDL block is revised or rewritten. It should be incremented by one and both DDS / PDL and SDL blocks should have the same revision counter value when initialization is completed.

Similarly, whether the value of N representing the SDL revision counter value in the four SDL1, SDL2, SDL3, and SDL4 is "0", the value of k representing the increment of the counter is "1" and the four values of the SDL revision counters You will see that they are all the same.

The basic structure of the DMA is recorded before the verification is started to determine a disk defect, and the bit value indicating "In-Progress" of the disk verification flags in the DDS of the DMA before the verification is set to "1". In the revision counter, the value of the counter is increased by one when the verification starts at the initial value of "0" and the verification is completed and the information on the defect is recorded by the DMA.

In addition, to confirm the DMA contents, it is checked whether all four DMA1, DAM2, DMA3, and DMA4 contents are identical.

Check items for checking the DDS structure in the DMA include the DDS identifier, the disk verification flag, the DDS / PDL revision counter, the number of groups, the number of regions, the location of the initial free space, the first logical sector number (as shown in FIG. 3). LSN0) location, the starting logical sector number location of each region, and the like.

That is, it is checked whether the DDS identifier is "0A0Ah", and whether the value of the bit position b7 indicating whether it is in-progress among the 1-byte disk verification flags is "0b", and at this time, the value of the bit position b7 If "0b" indicates that formatting is completed, if "1b" indicates that formatting is in progress, if "1b" indicates that the formatting has failed. Also, the bit position b6 reserved in the disk verify flag. Check that b2 is all "0b", check that the value of bit position b1 indicating the user verification flag is "1b", and check whether the value of bit position b0 indicating the disk manufacturer verification flag is "0b". .

To check the DDS / PDL revision counter, check whether the value of M representing the DDS / PDL revision counter is "0" and the value of k representing the increment of the counter is "1". Check whether it is 0001h "and" 0023h "which indicates whether there are 35 regions.

Also, it is checked whether the first sector number of the initial free space is "031000h" and the sector number of the last sector is "0341FFh", and the position of the first logical sector number LSN0 is determined by the number of defects registered in the PDL. Check if it is determined and determine whether the starting logical sector number of each region, that is, each starting logical sector number of the second region (Zone 1) to the 35th region (Zone 34) is also determined by the number of defects registered in the PDL. do. Here, a defect registered in the PDL is a physical defect already known on the C-1 disk, and even if there are other defects unknown on the C-1 disk, they are not considered in the initialization mode having verification for the test disk. However, all information about a defective sector of a known C-1 disc should be registered as a defective sector in the PDL. That is, the test can check not only whether the structure of the PDL is correct, but also whether the drive to be tested correctly detects a defect.

Check that all remaining reserved areas (byte positions 396 to 2047) of the DDS structure are all "00h".

In addition, the free space on the disk for defect management is divided into a primary spare area, a secondary spare area, and a supplementary spare area, and are defined as follows.

The primary free space is the first free space to be allocated when a disk is initialized for replacement of a defect, and is used first for a skip replacement, and the remaining free space may be used as a secondary free space for linear replacement. Secondary free space is a space for linear replacement of a defect occurring during the use of a disk, and refers to free space remaining or separately allocated free space used by a skip replacement among the first free spaces at the time of initialization. The additional free space is a free space for linearly replacing a defect that occurs while using a disk, and means additional free space allocated during use after initialization.

After initializing, if there is not enough free space for linear replacement while the disk is in use, the additional free space for linear replacement is allocated by gradually increasing the free space from the rear end of the logical volume space on the file system by a certain amount. For linear substitution, the reverse order is used from the very end of the logical file space.

The check items for checking the PDL structure in the DMA are the PDL identifier, the number of items in the PDL, the integrity of the PDL items, the un-used area, and the like, as shown in FIG.

Checks whether the PDL identifier is "0001h", the number of items in the PDL represents the number of defects, including known physical defects and defects that occur differently from disk to disk during manufacturing, and the configuration status of each PDL item is the item type. And the defective sector number. Here, it is checked whether the PDL item type is " 10b " representing a G1 list which is a defective sector generated during user verification, and the defective sector numbers of the PDL are written in ascending order of sector numbers. In addition, after all PDL items corresponding to the number of physical defects known in advance are written, and all information on defective sectors that occur differently for each disk during the manufacturing process of the disk is written, it is determined whether the remaining unused area is "FFh". Check it.

Check items for checking the SDL structure in the DMA, as shown in Figure 5, the SDL identifier, the SDL revision counter, the start sector number of the secondary free space (SSA), the total number of logical sectors, the DDS / PDL revision counter, Free space pool flag, number of items in SDL, configuration state of SDL items, unused area, and so on.

That is, it is checked whether the SDL identifier is "0002h", and in order to confirm the SDL revision counter item, it is checked whether the N value representing the SDL revision counter is "0" and the value of k representing the increment value of the counter is "1". do. To confirm the DDS / PDL revision counter item, it is checked whether the M value representing the DDS / PDL revision counter is "0" and the value of k representing the increment value of the counter is "1".

At initialization with verification, it is checked whether the starting logical sector number of the SSA and the total number of logical sectors have an appropriate value according to the size of the secondary free space designated by the user at initialization. The free space pool flag indicates a state in which the secondary free space is not full, and the number of items in the SDL should be set to "0" indicating that there is generally no present. In addition, since information should not exist in the byte position indicating the configuration state and the free space state of the SDL item, it is checked whether or not it is "FFh" indicating unused free space. However, if the C-1 disk used for testing is in very bad condition, an SDL entry may occur. Therefore, it is preferable to use a sufficiently good state of the C-1 disc.

As described above, the present invention makes it easy to check whether the DMA information generated by performing verification initialization in the recording / reproducing apparatus using a test disk having a known physical defect can be correctly decrypted and processed. There is.

Claims (26)

A method of confirming that DMA information is properly generated in a recording / reproducing apparatus for recording / reproducing an optical disc having defect management area (DMA) information: (a) generating the defect management information generated as test information after performing initialization with verification using a test disc having a known physical defect on the blank disc; And (b) verifying the test information using reference test information for initialization with the verification to provide a test result. The method of claim 1, wherein the test information is configured in the form of a DMA mirror file. The method of claim 1, wherein the test information is read directly from a defect management area of a disk initialized with the verification. The method of claim 1 wherein the method is (c) displaying the test results. The method of claim 1, wherein in the step (b), a DMA structure / data definition structure (DDS) structure / initial defect list (PDL) structure / secondary defect list (SDL) structure corresponding to the test information is checked, and verified. Verification method, characterized in that whether there exists a PDL entry for the G1 list representing a known physical defect through. The method of claim 1, wherein step (b) (b1) identifying the DMA structure; (b2) identifying the DDS structure in the DMA; (b3) identifying a PDL structure in the DMA; And (b4) confirming the SDL structure in the DMA. 7. The method as claimed in claim 6, wherein the check items for confirming the DMA structure in the step (b1) include an error state, a DDS / PDL, an SDL revision counter, DMA contents, and the like. The method of claim 6, wherein step (b1) (b1-1) checking whether an error exists in any one of a total of four DMAs present in two places in the lead-in area and the lead-out area of the disk; (b1-2) Whether the DDS / PDL revision counter value in the four DDSs and the DDS / PDL revision counter value in the four SDLs is "0" or the increment value of the counter is "1", and the DDS / PDL revision counter Checking that all eight values of are equal; (b1-3) checking whether the SDL revision counter value in the four SDL is "0", the increment value of the counter is "1", and whether all four values of the SDL revision counters are the same; And (b1-4) A check method comprising checking whether all four DMA contents are the same. The method of claim 6, wherein in step (b2), a check item for checking the DDS structure includes a DDS identifier, a disk verification flag, a DDS / PDL revision counter, a number of groups, a number of regions, a location of an initial free space, and a first position. A position of a logical sector number, a starting logical sector number position of each region, and the like. The method of claim 9, wherein step (b2) (b2-1) checking whether the DDS identifier is a predetermined value; (b2-2) checking whether the bit value indicating whether the disk verification flag is in progress or the bit value indicating disk manufacturer verification is "0b" and the bit value indicating user verification is "1b"; (b2-3) checking whether the DDS / PDL revision counter value is "0" and the increment value of the counter is "1"; (b2-4) checking whether the number of groups is a predetermined number; (b2-5) checking whether the area number is a predetermined number; (b2-6) checking whether the first sector number of the initial free space and the sector number of the last sector are predetermined sector numbers; (b2-7) checking whether the first logical sector number position is determined by the number of defects registered in the PDL; And (b2-8) checking whether the starting logical sector number of each region is determined by the number of defects registered in the PDL. 7. The method of claim 6, wherein the checking items for checking the PDL structure in the step (b3) include a PDL identifier, the number of items in the PDL, the integrity of the PDL items, and the like. The method of claim 11, wherein step (b3) (b3-1) checking whether the PDL identifier is a predetermined value; (b3-2) checking whether the number of items in the PDL matches the number of defects registered in the PDL; (b3-3) checking whether the type of the PDL item represents a G1 list indicating a defect generated through user verification and whether the corresponding defect sector number is the same. The method of claim 6, wherein in step (b4), a check item for checking the SDL structure includes an SDL identifier, an SDL revision counter, a start sector number of a secondary free space (SSA), a total number of logical sectors, and a DDS / And a PDL revision counter, a free space pool flag, the number of items in the SDL, and a configuration state of the SDL items. The method of claim 13, wherein step (b4) (b4-1) checking whether the SDL identifier is a predetermined value; (b4-2) checking whether the SDL revision counter value is "0" and the increment value of the counter is "1"; (b4-3) checking whether the DDS / PDL revision counter value is "0" and the increment value of the counter is "1"; (b4-4) checking whether the starting logical sector number of the SSA and the total number of logical sectors are set to match the size of the secondary free space designated by the user; And (b4-5) The free space pool flag indicates a state in which the secondary free space is not full, the number of items in the SDL is set to "0" indicating that there is no item, and whether information on the SDL item does not exist. And a step of checking. A device for testing whether or not DMA information is properly generated in a recording / reproducing apparatus capable of recording / reproducing and recording / reproducing an optical disk having defect management area (DMA) information: A retrofit drive device for generating DMA information generated from the test disc as test information after performing a verification initialization in the recording / reproducing apparatus using a test disc having a known physical defect on a blank disc; And And a checker for confirming the test result by checking the test information using reference test information for an initialization mode having the verification. The test apparatus according to claim 15, wherein the test information is configured in the form of a DMA mirror file. 18. The test apparatus of claim 16, wherein the test information is read directly from a defect management area of a disk initialized with the verification. 16. The apparatus of claim 15, wherein the identifier checks a DMA structure / data definition structure (DDS) structure / initial defect list (PDL) structure / secondary defect list (SDL) structure corresponding to the test information, and is known through verification. Testing device for determining whether a PDL item for a G1 list indicating a physical defect exists. 19. The test apparatus according to claim 18, wherein the check items for confirming the DMA structure are an error state of a DMA, a DDS / PDL, an SDL revision counter, DMA contents, and the like. 20. The apparatus of claim 19, wherein the identifier checks whether any one of a total of four DMAs present in each of two positions in the lead-in area and the lead-out area of the disc is present, and the DDS / PDL in the four DDSs. Checks whether the revision counter value and the DDS / PDL revision counter value in the four SDLs are "0" and the increment value of the counter is "1", and all eight values of the DDS / PDL revision counters are the same. Check whether the SDL revision counter value in the SDL is " 0 ", the increment value of the counter is " 1 " and the four values of the SDL revision counters are all the same, and whether the four DMA contents are the same. Characterized in that the test apparatus. 19. The method of claim 18, wherein the check items for checking the DDS structure include a DDS identifier, a disk verification flag, a DDS / PDL revision counter, a number of groups, a number of regions, a position of an initial free space, a position of a first logical sector number, And a starting logical sector number position of each region. 22. The device of claim 21, wherein the verifier checks whether the DDS identifier is a predetermined value, wherein a bit value indicating whether the disk verification flag is in progress and a bit value indicating disk manufacturer verification is "0b" and a user verification flag. Check whether the bit value indicating " 1b " is the value of the DDS / PDL revision counter is " 0 " and the increment value of the counter is " 1 " Checks whether the first sector number of the initial free space and the sector number of the last sector are predetermined sector numbers, and checks whether the first logical sector number position is determined by the number of defects registered in the PDL, and And checking whether the starting logical sector number of each region is determined by the number of defects registered in the PDL. Value. 19. The test apparatus according to claim 18, wherein the check items for checking the PDL structure include a PDL identifier, a number of items in the PDL, an Integrity of the PDL items, and the like. 24. The system of claim 23, wherein the identifier checks whether the PDL identifier is a predetermined value, checks whether the number of items in the PDL matches the number of defects registered in the PDL, and wherein the type of the PDL item is verified by the user. And a corresponding defect sector number is checked. 19. The method of claim 18, wherein the check items for checking the SDL structure include an SDL identifier, an SDL revision counter, a start sector number of a secondary free space (SSA), a total number of logical sectors, a DDS / PDL revision counter, and a free space. And a full flag, the number of items in the SDL, the configuration state of the SDL items, and the like. 26. The system of claim 25, wherein the identifier checks whether the SDL identifier is a predetermined value, checks whether the SDL revision counter value is "0" and the increment value of the counter is "1", and revises the DDS / PDL. Check whether the counter value is "0" and the increment value of the counter is "1", and the starting logical sector number of the SSA and the total number of logical sectors are set to match the size of the secondary free space specified by the user. The free space pool flag is set to " 0 " indicating that the secondary free space is not full, the number of items in the SDL is not present, and whether or not information on the SDL items is not present. Test apparatus, characterized in that.