KR20010063167A - Method for managing defect area in an optical disk reader/writer - Google Patents

Abstract

PURPOSE: A defect area management method of optical recorder/reproducer is provided to control defect sector listed in PDL effectively by reproducing data in an ECC block unit except a number of defect sector listed in PDL. CONSTITUTION: A data reproduction command is received(602). Information of LSN (Logical Sector Number) which is included in data reproduction command received from (602) stage is converted into information of PSN(Physical Sector Number)(603). Information of PDL(Primary Defect List) of user area block corresponding to PSN is acquired in reference to the information of (603) stage(607). A data reproduction is executed except defect sector listed in PDL using the information of PDL acquired from (607) stage(610).

Description

Method for managing defect area in an optical disk reader / writer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recorder, and more particularly, to a method for managing a defective area of an optical recorder, and more particularly, when a data is reproduced based on physical information of a rewritable optical recorder. A defect area management method of an optical recorder capable of efficiently controlling the listed defect sectors.

Generally, optical recording media are read-only ROM (ROM) type, write once read many (WORM) type, rewritable type, and the like which can be repeatedly recorded depending on whether repeat recording is possible. It is classified into three kinds.

Here, the ROM type optical recording medium includes a compact disc (CD) ROM and a digital versatile disc (DVD) ROM, and the WORM type optical recording medium is a compact disc (CD-R) that can be written once. Recodable Compact Discs and Recordable Digital Versatile Discs (DVD-R).

In addition, freely rewritable discs include a rewritable compact disc (CD-RAM) and a rewritable digital versatile disc (DVD-RAM).

On the other hand, in the case of a rewritable optical recording medium, the recording / reproducing operation of data is repeatedly performed due to its use characteristics, so that the mixing ratio of the mixture constituting the recording layer formed for data recording on the optical recording medium is equal to the initial mixing ratio. It becomes different and loses its characteristics, resulting in an error in recording / reproducing data.

This phenomenon is called deterioration, and this deteriorated area appears as a defective area when the format, recording and reproducing commands of the optical recording medium are executed.

In addition to the deterioration phenomenon, defect areas of the rewritable optical recording medium may be generated due to scratches on the surface, dust such as dust, errors in production, and the like.

Therefore, in order to prevent the recording / reproducing of data in the defect area formed due to the above reason, it is necessary to manage the defect area. As shown in Fig. 1, the lead-in area of the optical recording medium is shown. A defect management area (DMA) is provided in the area and the lead-out area to manage the defect area of the optical recording medium. In addition, the data area is managed by dividing it into zones for random access. Each zone has a user area in which actual data is recorded and a spare area for use when a defect occurs in the user area. spare area).

In general, four DMAs exist in one disk, two DMAs exist in the lead-in area, and the other two DMAs exist in the lead-out area.

In addition, the defect management area includes a PDL and a secondary defect list (SDL). Here, the PDL means a main defect data storage unit, and the SDL means a defective defect data storage unit.

In general, the PDL stores entries of defects that occur during the disc creation process and all defective sectors that are identified during formatting, i.e. initializing and re-initializing. Here, each entry is composed of an entry type and a sector number corresponding to a defective sector.

On the other hand, the SDL is listed in units of blocks, and stores entries of defect areas that occur after the format or defect areas that cannot be stored in the PDL during the format. Here, each SDL entry is composed of an area storing the sector number of the first sector of the block in which the defective sector has occurred, an area storing the sector number of the first sector of the replacement block to replace it, and an unused area. . In addition, each entry has one bit allocated for forced reassignment marking (FRM). If the value is 0b, the replacement block is allocated and there is no defect in the replacement block. 1b means that no replacement block is allocated or the allocated replacement block is defective.

Accordingly, the defective areas in the data area, that is, the defective sector or the defective block, are replaced with the normal area, and there are usually a slipping replacement method and a linear replacement method.

FIG. 2 is a diagram conceptually illustrating a state in which defective sectors listed in the PDL are replaced with corresponding normal sectors by execution of a general sleeping replacement method.

Referring to FIG. 2, the sleeping replacement method is applied when a defective area is registered in the PDL. If the defective sectors M and N listed in the PDL exist in the user area in which actual data is recorded, the defective sector is deleted. The data is skipped and replaced by the normal sector that follows the defective sector instead. Accordingly, the user area in which data is recorded occupies the spare area by the defective sector (m + n).

3 is a diagram conceptually illustrating a state in which a defective block listed in the SDL is replaced with a corresponding normal block by execution of a general linear replacement method.

Referring to FIG. 3, the linear replacement method is applied when the defective area is registered in the SDL. If the defective blocks P and Q listed in the SDL exist in the user area or the spare area, the unit of block allocated to the spare area is present. Are replaced by the replacement areas p and q, respectively.

However, the data reproduction command transmitted from the host is transmitted as Logical Sector Number (LSN) information, and the data processor performs data reproduction using PSN (Physical Sector Number) information corresponding to the LSN. On the other hand, in a rewritable optical recording medium, a header exists for each sector, and physical position information (Physical ID) is recorded in this header. In addition, the LSN and the PSN do not correspond linearly due to the spare area and the guard area for each zone, and the PSN values different depending on the state of the optical recording medium even in the same LSN due to a defect in the rewritable optical recording medium. Has

On the other hand, since the defective physical position information is recorded in the information recorded in the DMA, the physical position information should be taken as a reference when recording / reproducing the rewritable optical recording medium.

The present invention has been created in view of the above circumstances, and when a data is reproduced on the basis of physical information of a rewritable optical recording medium, a defective area of an optical recorder capable of efficiently controlling a defective sector listed in a PDL The purpose is to provide a management method.

1 is a diagram conceptually showing a configuration of a general rewritable optical recording medium.

FIG. 2 conceptually illustrates a state in which defective sectors listed in a PDL are replaced with corresponding normal sectors by execution of a general sleeping replacement method; FIG.

3 is a view conceptually showing a state in which a defective block listed in the SDL is replaced with a corresponding normal block by execution of a general linear replacement method.

4 is a schematic configuration diagram of an optical recording and reproducing system for implementing a defect area management method of an optical recording and reproducing apparatus according to the present invention;

FIG. 5 conceptually illustrates physical ECC blocks and actual ECC data processing blocks in a state in which defective sectors listed in the PDL are replaced with corresponding normal sectors by execution of a general sleeping replacement method; FIG.

Fig. 6 is a flowchart of processing defect sectors listed in the PDL by executing the defect area management method of the optical recorder according to the present invention.

FIG. 7 is a diagram conceptually showing a state in which defective sectors listed in the PDL and defective blocks listed in the SDL are replaced with normal sectors and blocks by the general sleeping replacement method and the linear replacement method, respectively; FIG.

Fig. 8 is a flowchart of processing defect blocks listed in the SDL by execution of the defect area management method of the optical recorder according to the present invention.

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

401 ... Disk 402 ... Data Processor

403 ... ECC memory section 404 ... DMA sector list section

405 ... micom 406 ... DMA list storage

407 ... host

In order to achieve the above object, a defect area management method of an optical recorder according to the present invention,

(a) receiving a data reproducing command;

(b) converting the LSN information included in the data reproduction command received in step (a) into PSN information;

(c) acquiring PDL information of a user area block corresponding to the PSN by referring to the PSN information of step (b); And

(d) using the PDL information obtained in step (c), excluding defective sectors listed in the PDL, and performing data reproduction.

Here, in reproducing the data in the step (d), data reproduction starts from the start sector of the physical Error Correction Code (ECC) block corresponding to the PSN, and 16 sectors except the defective sector listed in the PDL of the reproduction region. The data is reproduced in units, and the start sector of the physical ECC block converts the start sector of the LSN into PSN information, and then computes a bit AND operator on the start sector of the PSN. There is a characteristic in that point.

In the case of reproducing data in the step (d), if the PSN to be reproduced according to the subsequent data reproducing command is continuous, the PSN of the previously reproduced PSN is not reproduced from the start sector of the physical ECC block corresponding to the newly reproduced PSN. The feature is that data reproduction is performed from the sector following the last sector.

Also, in reproducing data in the step (d), if a defective block listed in the SDL is encountered during reproduction, the spare corresponding to the defective block listed in the SDL is referred to by referring to the number of defective sectors listed in the PDL of the corresponding zone. The feature is that data reproduction of the spare area is performed by excluding the number of defective sectors listed in the PDL from the physical ECC block boundary of the area.

According to the present invention as described above, when data is reproduced on the basis of the physical information of the rewritable optical recording medium, information on the number of defective sectors listed in the PDL of the reproduction area is provided to exclude the number of defect sectors listed in the PDL. By reproducing the data in units of ECC blocks, there is an advantage that the defective sectors listed in the PDL can be efficiently controlled.

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

4 is a schematic configuration diagram of an optical recording and reproducing system for implementing a defect area management method of an optical recording and reproducing apparatus according to the present invention.

Referring to FIG. 4, an optical recording and reproducing system for implementing a method for managing a defective area of an optical recording and reproducing apparatus according to the present invention includes recording on a disk 401, data read from the disk 401, and a disk 401. FIG. A data processor 402 for processing data to be processed; an ECC memory unit 403 for storing data in units of ECC blocks in which the data processor 402 reads / writes data; and DMA information of the disk 401. A DMA list storage unit 406, a microcomputer 405 for controlling the data processor 402, and a DMA sector list unit 404 for storing PDL information of a user area block to be reproduced by the data processor 402. And a host 407 for requesting data from the microcomputer 405.

In addition, FIG. 5 is a diagram conceptually showing a physical ECC block and an actual ECC data processing block in a state where defective sectors listed in the PDL are replaced with corresponding normal sectors by execution of a general sleeping replacement method. The defect sector processing flowchart listed in the PDL by the execution of the defect area management method of the optical recorder according to the present invention.

5 and 6, defect sector processing listed in the PDL by the execution of the defect area management method of the optical recorder according to the present invention will be described.

Here, in FIG. 5, A, B, and C represent starting sector positions in units of physical ECC blocks, respectively. In addition, X1, X2 and X3 represent defective sectors listed in the PDL, respectively, and E1, E2 and E3 represent starting sector positions in actual ECC block units that actually process data except for the defective sectors.

First, as the disc 401 is inserted into the optical recorder, the DMA information of the disc 401 is retrieved, and the information is stored in the DMA list storage unit 406 (step 601).

On the other hand, when a data reproducing command provided as LSN information is received from the host 407 (step 602), the microcomputer 405 converts the LSN information received from the host 407 into PSN information (step 603). It is determined whether the starting PSN is the starting position of the physical ECC block (eg, A of FIG. 5) (step 604).

At this time, as a result of the determination of step 604, if the starting PSN is not the start position of the physical ECC block, the PSN is changed to the start position (eg, A of FIG. 5) of the corresponding ECC block by using a bit AND operator. In step 605, it is determined whether the current position of the servo is in all blocks of the physical ECC block (step 606).

If the start PSN is the start position of the physical ECC block for reproducing data, it is determined whether the current position of the servo is in the previous block of the physical ECC block (step 606).

On the other hand, as a result of the determination in step 606, if the position of the servo is in all the blocks of the physical ECC block, PDL information of the ECC block to reproduce the data is obtained (step 607). As a result of the determination of step 606, when the position of the servo is not in the previous block of the physical ECC block, the controller waits until the position of the servo is in the previous block of the physical ECC block.

On the other hand, it is determined from the PDL information obtained in step 607 whether there are any defective sectors in the physical ECC block for reproducing the data (step 608), and if the defective sectors are found, the defective sectors (for example, X1 and X2 in FIG. 5). Information stored in the DMA sector list unit 404 (step 609), and a data reproduction start command is transmitted to the data processor 402 including the information stored in the DMA sector list unit 404 (step). 610).

If there is no defective sector as a result of the determination in step 608, the DMA sector list unit 404 is initialized (step 611), and a data reproduction start command is transmitted to the data processor 402 (step 610). Accordingly, while reproducing the data, it is determined whether the position of the servo is equal to the start position of the physical ECC block (for example, B of FIG. 5) (step 612), and the position of the servo is set to the start position of the physical ECC block. Otherwise, it waits by checking whether the position of the servo comes to the start position of the physical ECC block.

In addition, if it is determined in step 612 that the position of the servo is the start position of the physical ECC block (eg, B of FIG. 5), the DMA sector list unit 404 is initialized (step 613), and the physical ECC block is performed. Obtain PDL information for (step 614).

On the other hand, it is determined whether there is a defective sector in the next physical ECC block from the PDL information obtained in the step (step 615). If there is no defective sector, data reproduction is performed to perform a process after step 612, and a defective sector (e.g., If X3 of FIG. 5 exists, the PDL information is stored in the DMA sector list unit 404 (step 616), and data reproduction is performed to perform the process after step 612.

In this way, by providing the PDL information of the data reproducing area in the DMA sector list section 404, data is reproduced in units of actual ECC blocks starting with E1, E2, and E3 in FIG.

FIG. 7 is a diagram conceptually illustrating a state in which defective sectors listed in the PDL and defective blocks listed in the SDL are replaced with normal sectors and blocks, respectively, by the general sleeping replacement method and the linear replacement method, and FIG. The defect block processing flowchart listed in the SDL by the execution of the defect area management method of the optical recorder according to the present invention.

7 and 8, when a defect block listed in the SDL is encountered during data reproduction, an execution process of the defect area management method of the optical recorder according to the present invention will be described.

Here, in FIG. 7, M and N represent defective sectors listed in the PDL, and P represents defective blocks listed in the SDL. By the sleeping replacement method of the defective sectors M and N and the linear replacement method of the defective block P, the defective areas are replaced by m + n sectors and p blocks, respectively.

On the other hand, during data reproduction (step 801), SDL information for the next block to reproduce data is obtained (step 802), and it is determined whether the current servo position is the start sector position of the defective block listed in the SDL ( Step 803). At this time, as a result of the determination of step 803, if the servo position is not the start sector position of the defect block listed in the SDL, the servo waits by checking whether the position of the servo comes to the start sector position of the defect block listed in the SDL.

If the servo position is the start sector position of the defective block listed in the SDL, the DMA sector list unit 404 is initialized (step 804), and the PDL information of the zone reproducing the data is determined. Is obtained (step 805).

Accordingly, the DMA sector list unit 404 stores information about the number of defective sectors M and N listed in the PDL (step 806). Referring to this, data reproduction of the spare area is performed by excluding the number of defective sectors (m + n) listed in the PDL from the physical ECC block boundary of the spare area corresponding to the defective block listed in the SDL (step 807). ), The process after step 802 is performed.

As described above, the defect area management method of the optical recorder according to the present invention provides information on the number of defect sectors listed in the PDL of the reproduction area when data is reproduced based on the physical information of the rewritable optical record medium. By reproducing data in units of ECC blocks except for the number of defective sectors listed in the PDL, there is an advantage that the defective sectors listed in the PDL can be efficiently controlled.

Claims (5)

(a) receiving a data reproducing command; (b) converting Logical Sector Number (LSN) information included in the data reproduction command received in step (a) into PSN (Physical Sector Number) information; (c) obtaining primary defect list (PDL) information of a user area block corresponding to the PSN by referring to the PSN information of step (b); And and (d) excluding the defective sectors listed in the PDL by using the PDL information obtained in the step (c), and performing data reproduction. The method of claim 1, In reproducing the data in step (d), data reproduction starts from the start sector of a physical error correction code (ECC) block corresponding to the PSN, except for the defective sectors listed in the PDL of the reproduction region. A method for managing a defective area in an optical recorder, characterized in that data is reproduced in units of 16 sectors. The method of claim 2, The start sector of the physical ECC block converts the start sector of the LSN into PSN information, and then calculates a bit AND operator on the start sector of the PSN to obtain position information. How to manage defective areas on your player. The method of claim 1, In reproducing the data in step (d), if the PSN to be reproduced according to the subsequent data reproducing command is continuous, the last sector of the previously reproduced PSN is not reproduced from the start sector of the physical ECC block corresponding to the newly reproduced PSN. And reproducing data from the next sector of the optical disc recorder. The method of claim 1, In reproducing the data in the step (d), if a defect block listed in the SDL (Secondary Defect List) is encountered during reproduction, the SDL listed in the SDL is referred to by referring to the number of defective sectors listed in the PDL of the corresponding zone. A method for managing a defective area of an optical recording / reproducing apparatus, wherein data reproduction of the spare area is performed by excluding the number of defective sectors listed in the PDL from the physical ECC block boundary of the spare area corresponding to the defective block.