KR20010090971A - Method for verifying defect management area information of disc and test apparatus for performing the same - Google Patents

Abstract

PURPOSE: A method for detecting defect management area information of a disc and a test apparatus for performing the same are provided to verify whether defect management area information is normally decoded when a read/write mode is performed through a disc recorder/player. CONSTITUTION: A C-1 disc(201) is a disc having only physical defects to test a disc driving unit capable of recording/playing information on a rewritable disc. A DMA mirror file providing part(203) includes primary defect list and secondary defect list information and provides a DMA mirror file which is test reference information satisfying a condition where a supplementary spare area is not full. A reference disc driving unit(205) is a disc driving apparatus which is modified to test an apparatus capable of recording/playing information on the disc. A C-4 disc(207) is a disc satisfying a DVD-RAM condition of a phase change recording method and having 4.7GB. A unit(209) for driving a disc to be tested is a disc recorder/player capable of recording/playing information on a rewritable disc. When a signal indicating that a read/write mode is not normally performed is transmitted from the unit(209) for driving the disc to be tested, a verifier(211) outputs a test result informing that a DMA decoding function is normal. The read/write mode is performed using the disc having the test reference information. After identifying whether the read/write mode is performed, the DMA information decoding function is verified.

Description

Method for verifying defect management area information of disc and test apparatus for performing the same

The present invention relates to a device capable of recording / reproducing a disc capable of recording / reproducing. In particular, a device capable of recording / reproducing a disc is referred to as a defect management area (hereinafter, referred to as DMA) of the disc. The present invention relates to a method for verifying whether the system is normally generated / updated and a test apparatus for performing the same.

The above-described recordable / reproducible disc is an optical disc for recording and reproducing information by using a property of light such as a laser. For example, DVD-RAM (Digital Versatile Disc Random Access Memory, hereinafter referred to as DVD-RAM) is an example. have. This DVD-RAM is a rewritable disc. According to the "DVD Specifications for rewritable disc Part1 Physical Specifications version 2.0" standard, the above-described DVD-RAM has four DMAs (DMA1, DMA2, DMA3, DMA4) per side of the disk for managing defects on the disk. Done.

Of these four DMAs, DMA1 and DMA2 are located in the lead-in area adjacent to the inner diameter of the disk as shown in FIG. 1, and DMA3 and DMA4 are located at the outer diameter of the disk. It is located in an adjacent lead-out area. Each DMA is followed by reserved sectors.

Each of these DMAs stores a disc definition structure (weakly referred to as DDS), a primary defect list (weakly referred to as PDL) and a secondary defect list (weakly referred to as SDL). . The above-described DDS includes information on the formatted structure of the disc, such as a disc certification flag, a DDS / PLD update counter, and a starting logical sector number for each zone. The PDL contains information on all defective sectors on the disk found during disk initialization. The SDL contains the sector number and the defective block of the first sector of the defective block (1 error-correction code block) that occurred during disk use. And information about the sector number of the first sector of the spare blocks to be replaced and information about the spare area.

As such, the information stored in the DMA can be read and used immediately, but also includes information that changes according to the location and number of defects present on the disk, and through calculation based on the defect information registered in the DMA. Information obtained is also included. The information obtained through the calculation based on the defect information includes the location information of the start sector number or logical sector number 0 of each region.

Four DMAs per disk exist to prevent erroneous defect management due to errors in the DMA information. In addition, since the DMA information is closely related to the physical sector of data, a removable recording medium such as an optical disc has a problem of compatibility between disc recording / reproducing apparatuses when DMA information is incorrectly recorded and decoded. Will occur.

This includes the recording / playback layer of the disk recorder / player (eg DVD-RAM recorder), the filesystem layer, the host interface layer that connects the host computer and the recorder / player capable of recording and playback, and the physical signal. This is because recording and decoding of the DMA information is performed below the physical disk recording / reproducing device layer when the recording is divided into a physical disk recording / reproducing device (or disk driving device) layer and a recording medium layer.

That is, in the actual file system, only the logical sector number is used to transfer user information to be recorded or reproduced to the disc recording / reproducing apparatus, and the disc recording / reproducing apparatus replaces the logical sector number with a physical sector number to The recording or reproducing process is performed, at which time DMA information is used. Therefore, when DMA information is incorrectly decoded or recorded incorrectly by one disc recording / reproducing apparatus, there is a problem that data cannot be read or written correctly by another disc recording / reproducing apparatus.

Therefore, there has been a need for a method capable of accurately decoding DMA information recorded on a disc and confirming whether the disc recording / reproducing apparatus correctly generates / updates DMA information on the disc.

SUMMARY OF THE INVENTION The present invention has been made in accordance with the above-described requirements, and an object thereof is to provide a verification method for verifying whether or not defect management area (DMA) information is normally decoded when a read / write mode is performed through a disc recording / reproducing apparatus. .

Another object of the present invention is to create a blank disc and a test reference defect management area mirror file (DMA Mirror file) configured to satisfy a test condition when performing a read / write mode through a disc recording / playback apparatus. The present invention provides a verification method for verifying whether a disk DMA information is normally decrypted.

It is still another object of the present invention to normally decode DMA information of a disc having a defect management area information in which a start logical sector number (start LSN) of each zone has an incorrect start / write mode through a disc recording / reproducing apparatus. It is to provide a verification method for verifying that.

Another object of the present invention is to provide a test apparatus for testing whether the defect management area information is normally decoded when the read / write mode is performed through the disc recording / reproducing apparatus.

1 is a schematic structural diagram of a rewritable disc.

2 is a functional block diagram of a test apparatus according to the present invention.

FIG. 3 is a DDS structure diagram of a defect management area (DMA) of the C-4 disc shown in FIG.

4 is an operational flow diagram for a verification method according to the present invention.

<Description of the symbols for the main parts of the drawings>

201: C-1 disk 203: DMA mirror file provider

205: reference disk drive 207: C-4 disk

209: Test drive disk drive 211: Verifier

In order to achieve the object of the present invention, the method according to the present invention is a method for verifying the DMA information decryption function of a recording / reproducing apparatus capable of recording / reproducing a disc having defect management area (DMA) information. a) performing a read / write mode in the recording / playback apparatus using a test disc having test reference information; (b) verifying whether the recording / playback apparatus has performed the read / write mode and deciphering the DMA information; It is preferable to include the step of verifying.

In order to achieve the objects to be achieved by the present invention, an apparatus according to the present invention is a device for testing a DMA decryption function of a recording / reproducing apparatus capable of recording / reproducing a disc having a defect management area (DMA) information. A test disc having test reference information; When the test disk is installed, it is preferable to include a test target disk drive that attempts to perform the read / write mode by decrypting the DMA information recorded on the test disk.

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

FIG. 2 is a functional block diagram of a test apparatus for a disk drive apparatus according to the present invention, and includes a C-1 disk 201, a defect management area (hereinafter, referred to as DMA), and a mirror file providing unit ( 203, reference drive 205, C-4 disc 207, drive to be tested 209, and verifier 211.

The C-1 disc 201 tests a disc drive device capable of recording / reproducing information on a disc that can be recorded again, such as a DVD-RAM (Digital Versatile Disc Random Access Memory). It is a test disc that is manufactured so that a physical defect exists artificially. An empty disc in which no information is recorded. The physical defects present in the C-1 disk 201 are used as information known in advance when testing a desired disk drive. In addition, the C-1 disc 201 is subjected to the DVD-RAM condition of the phase change recording method having a capacity of 4.7 GB (Giga Bytes) specified in the "DVD specification for Rewritable disc version 2.0 standard" for a disc which can be rewritten. The disk is configured to satisfy.

As shown in FIG. 1, the DMA mirror file provider 203 provides information about a disk definition structure (hereinafter, referred to as DDS), a primary defect list (hereinafter referred to as PDL), and a secondary defect list (hereinafter referred to as SDL). Provides a test criteria DMA mirror file containing

In particular, the provided test reference DMA mirror file is a deliberate erroneous recording of the start logical sector number (hereinafter, referred to as start LSN) of each zone. The information on the starting LSN is recorded in the DDS of the DMA as shown in FIG. 3, and there are 35 pieces when there are 35 regions in one disk. This is because the starting LSN is the first sector where data is normally recorded for each region. The test-based DMA mirror file described above may be provided in a form in which not only the starting LSN of each region is recorded incorrectly but also all kinds of defect information.

The reference disc drive device 205 is a test disc record / playback device that is capable of modified recording / playback for testing a disc drive device capable of recording / reproducing information on a disc. When the C-1 disk 201 is installed and the test reference DMA mirror file is provided from the DMA mirror file providing unit 203, the reference disk drive unit 205 transfers the provided DMA mirror file to the C-1 disk 201. It is configured to generate the recorded C-4 disc 207. At this time, the DMA mirror file recorded on the C-1 disk 201 is recorded regardless of the physical defects present in the C-1 disk 201. Therefore, the C-4 disk 207 is a disk in which a test defect DMA mirror file is recorded while there is a physical defect existing in the C-1 disk 201 and irrelevant to this physical defect. The DMA recorded on this C-4 disk 207 is pre-fixed information known to the user. The C-4 disc 207 is subjected to a DVD-RAM condition of a phase change recording method having a capacity of 4.7 GB (Giga Bytes), which is defined in the "DVD specification for Rewritable disc version 2.0 standard" for a recordable disc again. The disk is configured to satisfy.

The test target disk drive 209 is a disk recording / reproducing apparatus configured to record / reproduce information on a recordable disk again. When the C-4 disk 207 configured as described above is installed, the test target disk drive 209 performs a read / write mode for the user data area. The test drive disk drive 209 finds and reads the corresponding position in the user data area by referring to the position of LSN0 recorded in the DMA of the installed C-4 disk 207 and the position of the start LSN of each zone. Enter / write mode.

However, the C-4 disk 207 installed as described above is a wrong recording of the starting LSN, so that the read / write mode is not performed when the test target disk drive 209 is a device that is normally operated. The result of performing the read / write mode of the test target disk drive 209 is provided to the verifier 211.

The verifier 211 transmits a test result indicating that the DMA decryption function of the test disk drive 209 is normal when a signal indicating that the read / write mode is not normally performed from the test disk drive 209 is transmitted. Output However, when a signal indicating that the read / write mode is normally performed is transmitted, a test result indicating that the DMA decryption function of the test target disk drive 209 is not normal is output.

The result of performing the read / write mode of the test target disk drive 209 may not be output through the verifier 211 as described above, but may be implemented to be output at the level of the test target disk drive 209. . That is, the user may be implemented in such a manner as to confirm whether the user performs the read / write mode of the test target disk driving apparatus 209 without passing through the verifier 211.

4 is an operational flow diagram of the test method of the disk drive apparatus according to the present invention, in which the C-1 disk 201 having the same conditions as in FIG. 2 described above in step 401 has the same conditions as in FIG. A test reference DMA mirror file is recorded to create a C-4 disc 207.

Then, in step 402, if the C-4 disk 207 is installed in the test drive disk drive 209, in step 403, the test drive disk drive 209 performs a read / write mode for the user data area. do. At this time, the test target disk drive 209 refers to the LSN0 recorded in the DDS of the DMA of the installed C-4 disk 207 and the starting LSN of each region. Since the recorded start LSN does not match the actual start LSN of the user data area, the read / write mode should not be performed when the function of the test drive disk drive 209 is normal.

Therefore, in step 404, it is checked whether the read / write mode of the test target disk drive 209 is performed. As a result of the check, if the read / write mode is performed, the process proceeds to step 405 to notify that the DMA decryption function of the test target disk drive 209 is abnormal.

However, if the read / write mode of the test target disk drive 209 is not performed as a result of checking in step 404, the flow proceeds to step 406 to notify that the DMA decryption function of the test target disk drive 209 is normal. Done.

The above-described embodiment can also be applied to an environment in which the structures of the C-1 disc 201 and the C-4 disc 207 satisfy the disc standard 2.0, which can be recorded again.

As described above, the present invention reads a test target disk drive apparatus using a test disk (C-4 disk) produced by using a test-based DMA mirror file in which a blank disk and a start logical sector number (start LSN) are recorded incorrectly. By testing the DMA decryption function of the disk drive by judging whether the write / write mode is performed, it is possible to confirm whether the DMA decryption function is normally performed when the disk drive is executed in the read / write mode. Providing can prevent the economic loss of the manufacturer and the user.

Claims (18)

A method for verifying the DMA information decryption function of a recording / reproducing apparatus capable of recording / reproducing a disc having defect management area (DMA) information, the method comprising: (a) performing a read / write mode in the recording / reproducing apparatus by using a test disc having test reference information; (b) verifying whether the recording / reproducing apparatus performs the read / write mode to verify the DMA information decryption function. The verification method as claimed in claim 1, wherein the test criterion information is configured in the form of a mirror file. The method of claim 1, wherein the test criterion information is configured in the form of a defect management area mirror file. 4. The verification method according to claim 3, wherein the test criterion information comprises a defect management area mirror file in which a start logical sector number of at least one zone is recorded incorrectly. 4. The verification method according to claim 3, wherein the test criterion information is composed of a defect management area mirror file in which a start logical sector number of each area is recorded incorrectly. 6. The method according to claim 4 or 5, wherein in step (b), when the recording / reproducing apparatus performs the read / write mode, the recording / reproducing apparatus normally decrypts the defect management area of the test disc. And verifying that the verification is not performed. The method of claim 1, wherein (c) recording the test criterion information on a blank disk to generate the test disk. 8. The test method of claim 7, wherein the step (c) records the test criterion information regardless of the physical condition of the blank disk. An apparatus for testing the DMA decryption function of a recording / reproducing apparatus capable of recording / reproducing a disc having defect management area (DMA) information, the apparatus comprising: A test disc having test reference information; And a test target disk drive device that, when the test disk is installed, attempts to perform a read / write mode by decrypting DMA information recorded on the test disk. The test apparatus of claim 9, wherein the test criterion information is configured in the form of a mirror file. The test apparatus according to claim 9, wherein the test criterion information is configured in the form of a defect management area mirror file. The test apparatus according to claim 11, wherein the test criterion information comprises a defect management area mirror file in which at least one starting logical sector number is erroneously recorded. The test apparatus according to claim 11, wherein the test criterion information comprises a defect management area mirror file in which a start logical sector number of each region is recorded incorrectly. The test apparatus according to claim 12 or 13, wherein the test target disk driving apparatus performs the read / write mode when the defect management area of the test disk cannot be decrypted normally. 10. The test apparatus according to claim 9, wherein the test apparatus further comprises a reference disk driving device for recording the test reference information on a blank disk to generate the test disk. The test apparatus according to claim 15, wherein the reference disc drive device records the test reference information regardless of the physical condition of the blank disc. The test apparatus of claim 9, wherein the test apparatus of the disk driving apparatus further includes a verifier verifying whether the test disk driving apparatus performs the read / write mode and verifying a state of the test disk driving apparatus. Testing device. 18. The test apparatus of claim 17, wherein the verifier notifies the user that the test disk drive is abnormal when the test disk drive is determined to perform the read / write mode. .