KR100396618B1 - Apparatus and method for managing a defect area on rewritable medium - Google Patents

Abstract

The present invention relates to a defect management method and apparatus for a rewritable recording medium, comprising: a first area in which data having a specific purpose of a sub-queue data format is recorded, and management information for managing a defective area of a recording medium; CLAIMS What is claimed is: 1. A method of generating and recording defect management information of a recording medium having a second area, the method comprising: generating defect management information for a defect area identified through an error verification process; And recording the generated defect management information into a second area specified for managing the defect area, wherein the generated defect management information includes a defect area having an error correction error or a defect area having a high probability of occurrence of an error correction error. In addition, the management information is recorded in some areas in the program memory (PMA) area, and when a data recording operation or a reproducing operation is performed, a reading error or a recording error in which the input data is rewritten to the defective area is recorded. It is a very useful invention that it is possible to prevent a reproducing error of unnecessarily repeatedly reproducing data, thereby making stable data recording and reproducing operations.

Description

Apparatus and method for managing a defect area on rewritable medium}

The present invention relates to a defect management method and apparatus of a rewritable recording medium, and more particularly, to a rewritable recording medium having sub-Q channel data such as CD-RW (CD-Rewritable). , Error correction (ECC) error correction method or apparatus for recording and managing management information on a defect area where an error occurs or a defect area that is likely to cause an error correction error. It is about.

Optical discs, a type of optical recording medium, have been widely used due to the widespread use of CDs (CDs). Such optical discs include CD-ROMs for reproduction only, CD-Rs capable of recording data once, and And CD-RWs that can be rewritten at least twice.

In addition, recently developed digital versatile discs (DVDs) include a DVD-ROM for playback, a DVD-R capable of recording data only once, and a DVD-RAM capable of rewriting two or more times. There is this.

On the other hand, in the case of a rewritable recording medium such as a DVD-RAM, in order to improve the reliability of data recording and reproducing, a bad sector in which an error occurs more than a certain level among the unit sectors which are the basic recording units of the rewritable recording medium. Management information about the physical defect area in which the defects are present is recorded and managed in the lead-in area, so that the data is not rewritten in the defect area or control is performed so as not to repeatedly reproduce the defective area in the reproduction operation.

However, in a rewritable recording medium such as a CD-RW, since management information for a defective area is not separately recorded and managed as in a DVD-RAM, defects such as scratches can be rewritten such as a CD-RW. When the recording medium is present on the recording medium, the data is rewritten in the defective area despite the defective area, or repeatedly reproduced in the defective area within a predetermined time, for example, 8 seconds. As the operation is performed, a data recording error occurs, and during playback, the user may not know the system operation for a long time of 8 seconds and may feel uncomfortable.

Further, in a rewritable recording medium such as the CD-RW, a lead-in area for each recording data unit is a program memory area (PMA: program memory) for temporarily managing management information such as an address of the recording data area after data recording. Since the area is created and then partitioned, the defect management information for the detected defective area is read through the error detection and correction operation during the reproduction of the recording area or the recording data, as in the case of DVD-RAM. There is a problem in that it is not possible to record and store directly in the print area.

Accordingly, the present invention was created to solve the above problems, and in a rewritable recording medium having sub-queue channel data such as CD-RW, there is a possibility that a defective area or error correction error may occur. A method of managing a defective area of a rewritable recording medium capable of recording and managing management information about a high defective area in a program memory (PMA) area instead of a lead-in area, thereby preventing a recording error and a reproduction error caused by the defective area. It is an object to provide an apparatus.

1 illustrates a configuration of a defect management apparatus of a rewritable recording medium according to the present invention.

2 shows the structure of a rewritable recording medium according to the present invention;

3 and 4 illustrate an operation flowchart of a defect management method of a rewritable recording medium according to the present invention;

5 shows defect management information recorded and managed by a defect management method of a rewritable recording medium according to the present invention.

※ Explanation of code for main part of drawing

1: recording medium 2: optical pickup

3: recording signal processing section 4: reproduction signal processing section

5: defect detection unit 6: interface unit

7: control unit 8: memory

9: Servo

A defect management method of a rewritable recording medium according to the present invention for achieving the above object comprises a first area in which data having a specific purpose of a sub-queue data format is recorded, and a defect area of a recording medium. CLAIMS 1. A method for generating and recording defect management information of a recording medium having a second area having management information, the method comprising: generating defect management information for a defect area identified through an error verification process; And recording the generated defect management information in the specified second area for managing the defect area.

In addition, the defect management apparatus of a rewritable recording medium according to the present invention includes a first area in which data having a specific purpose of a sub-queue data format is recorded, and a second having management information for managing a defect area of the recording medium. An apparatus for generating and recording defect management information of a recording medium having an area, comprising: error detecting means for detecting a defective area of the recording medium; Defect information generating means for generating defect management information on the basis of the error detected by the error detecting means; And control means for controlling the generated defect information to be recorded in a specified second area for managing the defect area.

In addition, the recording medium according to the present invention comprises: a recording medium having sub cue channel data, comprising: a first area in which data having a specific purpose of a sub cue data format is recorded; And a defective area of the recording medium.

Hereinafter, a preferred embodiment of a defect management method and apparatus for a rewritable recording medium according to the present invention will be described in detail with reference to the accompanying drawings.

First, Fig. 1 shows a configuration of a defect management apparatus of a rewritable recording medium according to the present invention. The configuration of the defect management apparatus, for example, a CD-RW drive, is a rewritable recording such as a CD-RW. An optical pickup 2 for reading out or recording a signal stored in the medium 1; A servo unit (9) for controlling the servo operation of the optical pickup; A reproduction signal processing unit (4) for processing reproduction signals from the optical pickup into digital data; A defect detector (5) for detecting whether a signal read out from the optical pickup is defective; A control unit (7) for generating management information for managing a defective area in which the defect is detected, and controlling a data recording operation and a reproducing operation based on the defective area management information; A storage unit 8 for storing the defect area management information; And an interface unit 6 performing a data interface operation with an external connection device.

Accordingly, the control unit 7 reads and reproduces the signal recorded immediately before, while recording data input from the outside through the interface unit 6 to the rewritable recording medium 1, to determine whether there is a defect. If it is determined that the defect is determined, the management information for managing the defect area is generated and stored in the memory 8 as a primary defect list (PDL), at the request of the user. While reproducing the data stored in the rewritable recording medium 1, after confirming whether or not there is a defect in the data to be read out and reproduced, management information for managing the defective area is generated and stored in the memory 8 in a secondary manner. Secondary Defect List (SDL) is divided and stored.

Thereafter, an initial defect list or a secondary defect list stored separately in the memory 8 is recorded and stored in the PMA area of the rewritable recording medium 2, wherein the rewritable recording in which the defect area management information is recorded and stored. The structure of the medium is as follows.

Fig. 2 shows the structure of a rewritable recording medium according to the present invention. For example, in the structure of a CD-RW, control information for controlling the optical power of a laser diode provided in the optical pickup 2 is recorded. A power calibration area (PCA) area and a PMA area in which management information for managing data recorded in the program area is recorded are disposed inside the center of the recording medium, and the lead-in area, program area data and lead-out are A plurality of sessions consisting of an area are sequentially arranged, and a part of the PMA area, for example, the last 8 blocks of the PMA area having a recording size of about 975 blocks, the defect management area (DMA: Defect Management Area) to manage a defective area in which an error correction error has occurred or a defective area in which error correction error is likely to occur. Information is written stored.

On the other hand, the DMA area is divided into a PDL in which management information for a defective area detected during reproduction is recorded immediately after performing a recording operation, and an SDL in which management information for a defective area detected during reproduction is performed. In the PDL, a defect area identified through an error certification process in manufacturing an optical disc, for example, start and end address information of a predetermined error correction block, or a defect block identified through an error verification process according to a user's request Start and end address information is recorded and stored, and the SDL stores and stores start and end address information of an error correction block in which a predetermined number or more errors occur when performing error correction on data to be read and reproduced.

For reference, since the error correction block has a fixed write size, only the start address information of the error correction block in which a predetermined number or more errors have occurred may be recorded and stored in the SDL.

Hereinafter, a method of controlling data recording and reproducing operations using the defect management information recorded and stored as described above will be described in detail.

First, FIG. 3 shows an operation flowchart for a data rewriting operation performed by a defect management method of a rewritable recording medium according to the present invention, wherein a rewritable recording medium 1 such as a CD-RW is a CD-. When it is inserted and seated in the RW drive (S10), the controller 7 searches for defect management information recorded in the PMA area of the rewritable recording medium 1, that is, the DMA area allocated to the last 8 blocks of the PMA area. Then, the address information of the defective block stored in the PDL and the SDL is read out, downloaded to the memory 8, and temporarily stored (S11).

Subsequently, when a data rewrite operation is requested from the user (S12), the requested data recording position is searched. The searched recording position is compared with the defect management information stored in the memory 8, and the searching is performed. It is determined whether the recorded recording position corresponds to the defective area (S13).

As a result of the determination, if it is a defective area, the defective area is skipped, moved to an adjacent non-defective area (S14), and then a data recording operation for recording input data is performed. As a result, if it does not correspond to the defective area, a recording operation for recording the input data at the searched recording position is performed (S15), after which the above operation is repeated, and the recording end is requested, or the recording operation is performed. Is completed (S16), the data rewriting operation is terminated.

Accordingly, it is possible to fundamentally prevent a recording error in which the input data is rewritten in the defect area corresponding to the defect management information temporarily stored in the memory 8.

On the other hand, Figure 4 shows an operation flowchart of the data reproduction operation performed by the defect management method of the rewritable recording medium according to the present invention, as described above, the rewritable recording medium (1) Is inserted into the CD-RW drive (S30), the control unit 7 allocates the last 8 blocks of the defect management information recorded in the PMA area of the rewritable recording medium 1, that is, the PMA area. The DMA area is searched to read the address information of the defective blocks stored in the PDL and the SDL, downloaded to the memory 8, and temporarily stored (S31).

Thereafter, when a data reproducing operation is requested from the user (S32), the requested data recording position is searched. The searched recording position is compared with the defect management information stored in the memory 8, and the searching is performed. It is determined whether the recorded recording position corresponds to the defective area (S33).

As a result of the determination, if it is a defective area, the defective area is skipped and moved to an adjacent non-defective area (S34), and then a data reading operation of reading data recorded at the corresponding recording position is performed. On the other hand, if the result of the determination does not correspond to the defective area, a data reading operation for reading data recorded at the corresponding recording position is performed (S35).

Thereafter, the data read out is error-corrected to process the reproduction signal as normal digital data. In this case, when error correction is not normally performed, that is, when error correction is performed on the read and reproduced data, more than a certain number of errors are detected. When it occurs (S36), the SDL update operation for recording and storing the start and end address information of the error correction block in the SDL temporarily stored in the memory 8 is performed (S17), and then the above operation is repeatedly performed. When data reproduction is requested in the middle or the reproduction operation is completed (S38), the data reproduction operation is terminated and the SDL, i.e., defect management information, which is updated and stored in the memory 8, can be rewritten. The record will be saved in.

Accordingly, in the DMA area allocated to the last 8 blocks of the PMA area of the rewritable recording medium 1, as shown in FIG. 5, an error verification process at the time of manufacturing an optical disc or an error verification process according to a user's request is performed. The initial defect entry information (PDf0_Ent. PDf1_Ent ..), which records the start and end address information of the identified defect blocks PDf0 and PDF1 .., and the error correction of the data to be read out and reproduced, have a predetermined number or more. Secondary defect entry information (SDf0_Ent, SDf1_Ent ..), including the start and end address information of the generated error correction blocks (SDf0, SDf1 ..), is updated and recorded in the PDL and SDL, respectively, as described above. In the same manner, it is possible to prevent a recording error in which the input data is rewritten in the defective area, as well as to prevent a reproduction error in reproducing the defective area in which the error has occurred.

On the other hand, at least one reference error value for determining the occurrence of an error is made smaller than the predetermined number, so that management information for a defective area with a high probability of error correction error can be recorded and managed, thereby making it more stable data. The recording operation and the reproduction operation can also be performed.

As mentioned above, preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve and change various other embodiments within the technical spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.

The defect management method and apparatus for a recording medium according to the present invention configured as described above is a defect area or error correction error occurring in a rewritable recording medium having sub-queue channel data such as CD-RW. Records management information on the probable defect area in some areas of the program memory (PMA) area, and reads and confirms the data when the data recording or reproducing operation is performed, and rewrites the input data into the defective area. It is a very useful invention that it is possible to prevent a reproducing error of unnecessarily repeatedly reproducing data recorded in an error or a defective area, thereby achieving a stable data recording and reproducing operation.

Claims (15)

A recording medium in a sub cue channel data format, wherein the recording medium comprises a lead-in area, a data area and a lead-out area A first area in which management information of data to be recorded in the lead-in is temporarily recorded when data is recorded, and located inside the lead-in area; And And a second area having management information for managing a defective area of said recording medium, said second area being located in said first area. The method of claim 1, And the first area is an area for temporarily recording address information for each recording data unit. The method of claim 1, And the second area is located at a position where the first area is adjacent to the lead-in area. The method of claim 1, And the second area is allocated for recording defective area address information confirmed through a verification operation on a physical defective area generated during manufacture of the recording medium. The method of claim 1, And the second area is allocated to record a defective block address determined to be a defective area, at least when performing error correction during reproduction. The method of claim 5, The determination of the defective area when the error correction is performed is determined by an error rate of at least one or less than the number of errors that are determined to be error correction incapable. In the sub-queue data format, a data recording device has a first area in which management information of the data to be recorded in the lead-in is temporarily recorded, and a second area having management information for managing a defective area of a recording medium, 12. A method of generating and recording defect management information of a recording medium in which the second area is allocated within the first area and the first area is located inside the lead-in area. Generating a defect management information on a defect area identified through an error verification process; And And recording the generated defect management information into a second area specified for managing the defect area. The method of claim 7, wherein When performing error correction of the data read out and reproduced from the recording medium, rewrite of the defect management information for the defective area in which a predetermined number or more of errors occurs is recorded in the second area specified for managing the defective area. How to manage defects on recordable media. The method of claim 8, And the defect management information includes at least start address information of the defect area. In the sub-queue data format, a data recording device has a first area in which management information of the data to be recorded in the lead-in is temporarily recorded, and a second area having management information for managing a defective area of a recording medium. An apparatus for generating and recording defect management information of a recording medium in which the second area is allocated in the first area and the first area is located inside the lead-in area. Error detecting means for detecting a defective area of the recording medium; Defect information generation means for generating defect management information on the basis of the error detected by the error detection means; And And control means for controlling the generated defect information to be recorded in a specified second area for managing the defect area. The method of claim 10, And the error detecting means detects whether or not there is a defect in data read and reproduced from the recording medium. The method of claim 11, And the error detecting means detects whether or not a defect of data read and reproduced from the recording medium is detected in an error correction block unit. The method of claim 10, And the control means generates the defect management information for the defect area detected by the error detecting means, and controls the defect management information to be updated and recorded. In the sub-queue data format, a data recording device has a first area in which management information of the data to be recorded in the lead-in is temporarily recorded, and a second area having management information for managing a defective area of a recording medium, 10. A method for reproducing recorded data from a recording medium in which the second area is allocated within the first area and the first area is located inside the lead-in area. Determining whether error correction of the reproduction data is impossible; And And determining whether or not to retry error correction based on the defective area information of the second area according to the determination result. In the sub-queue data format, a data recording device has a first area in which management information of the data to be recorded in the lead-in is temporarily recorded, and a second area having management information for managing a defective area of a recording medium, 10. An apparatus for reproducing recording data from a recording medium in which the second area is allocated within the first area and the first area is located inside the lead-in area. Error detection and correction means for determining whether error correction of reproduction data is impossible; And And control means for determining whether to retry error correction on the basis of the defective area information of the second area according to the determination result.