KR20010063164A - Method for managing defect area in an optical disk reader/writer - Google Patents

Abstract

PURPOSE: A defect area management method of optical recording reproducing apparatus is provided to shorten data processing time by dividing stage for recording/reproducing data at user area and stage for recording/reproducing data at spare area. CONSTITUTION: A data recording command is received(a). SDL(Secondary Defect List) information of user area to record data is acquired according to reception of command and data recording according to command is executed(b). A data to record at defect block listed in SDL is stored in a memory part using SDL information acquired from (b) stage if defect block listed in SDL is encountered during executing data recording at user area(c). A data recording is executed continuously according to data recording command received at (a) stage after executing (c) stage. A data stored in the memory part is recorded at an alternative spare block corresponding to a defect block listed in SDL if the data recording command is completed(e).

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 defect area of an optical recorder, and more particularly, in processing data of a defect area of a rewritable optical record medium. The present invention relates to a defect area management method of an optical recorder capable of reducing data processing time by reducing movement.

In general, optical recording media have a read only memory (ROM) type, a write once read many (WORM) type, and a rewritable recording type, depending on whether repeat recording is possible. It is classified into three types such as possible type.

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 write once compact disc (CD-R). 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, and lead-in area and lead-out area of the optical recording medium A defect management area (DMA) is provided in the -out area to manage the defect area of the optical recording medium.

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

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

Referring to FIG. 1, the sleeping replacement method is applied when a defective area is registered in a PDL, and includes a defect sector M listed in the PDL in a user area in which actual data is recorded. If N exists, the defective sector is skipped, and instead, the data is replaced by the normal sector following the defective sector. Accordingly, the user area in which data is recorded occupies the spare area by the defective sector (m + n).

2 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. 2, 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 linear replacement method is applied to the spare area. The data is recorded by being replaced by the replacement areas p and q in the allocated block units.

By the way, according to the conventional defect area management method of the optical recorder, if there is a defect block listed in the SDL in the user area to record / reproduce the data, the user area and the defect block are used to record / reproduce data in the user area. The servo has to repeatedly move the spare area corresponding to, and this results in a slow data processing speed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in processing data in a defective area of a rewritable optical recording medium, a defect area management method of an optical recorder capable of shortening data movement time by reducing servo movement. The purpose is to provide.

1 is a diagram conceptually illustrating 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. 2 conceptually illustrates a state in which defective blocks listed in the SDL are replaced with corresponding normal blocks by execution of a general linear replacement method; FIG.

3 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. 4 is a diagram showing the contents of recording SDL used in a defect area management method of a general optical recorder.

Fig. 5 is a diagram showing recording contents of an SDL used for a defect area management method of an optical recorder according to the present invention, data stored in an SDL replacement block memory, and an SDL pointer list.

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

301 ... Disk 302 ... Data Processor

303 ... ECC memory section 304 ... SDL pointer list section

305 ... micom 306 ... DMA list storage

307 ... SDL replacement block memory section 308 ... 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 write command;

(b) acquiring SDL information of a user area in which data is to be recorded, upon receiving the command, and performing data recording according to the command;

(c) If the defective block listed in the SDL is encountered during data recording in the user area by using the SDL information obtained in the step (b), the data to be written in the defective block listed in the SDL is stored in the memory means. Making a step;

(d) performing step (c) and continuing to record data in accordance with the data write command received in step (a); And

and (e) writing the data stored in the memory means to a spare spare block corresponding to the defective block listed in the SDL when the data write command is terminated.

Here, the storage in the memory means in step (c) is characterized in that it further includes a replacement spare block address corresponding to the defective block listed in the SDL, and address information stored in the memory means.

In addition, another embodiment of the defect area management method of the optical recorder according to the present invention in order to achieve the above object,

(a) receiving a data reproducing command;

(b) acquiring SDL information of a user area to reproduce data;

(c) using the SDL information obtained in step (b), reproducing the data recorded in the spare spare block corresponding to the defective block listed in the SDL, and storing the data in the memory means;

(d) performing step (c) and transmitting data stored in the memory means when encountering a defective block listed in the SDL during data reproduction according to the data reproduction command received in step (a); And

(e) after transmitting the data stored in the memory means, continuing the data reproduction according to the data reproduction command received in step (a).

Here, the storing in the memory means in the step (c) is characterized in that it further includes a replacement spare block address corresponding to the defective block listed in the SDL, and address information stored in the memory means.

According to the present invention, in processing data in a defective area of a rewritable optical recording medium, the data recording / reproducing in the user area and data recording / reproducing in the spare area are performed separately. There is an advantage that can reduce the data processing time by reducing the movement of.

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

3 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. 3, an optical recording / reproducing system for implementing a defect area management method of an optical recording / reproducing apparatus according to the present invention includes a disk 301, data read from the disk 301, and recording onto a disk 301. FIG. A data processor 302 for processing data to be processed; an ECC memory unit 303 for storing data in units of Error Correction Code (ECC) blocks in which the data processor 302 reads / writes data; and the disk 301. A DMA list storage unit 306 for storing DMA information, a microcomputer 305 for controlling the data processor 302, and a defect block listed in the SDL in reading / writing data by the data processor 302. A host requesting data from the SDL replacement block memory unit 307 storing data to be processed, the SDL pointer list unit 304 from which the recording information of the SDL replacement block memory unit 307 is input, and the microcomputer 305. Contains 308 The.

4 is a diagram showing the contents of recording SDL used in a defect area management method of a general optical recorder, and FIG. 5 is a diagram showing an SDL and an SDL replacement block used in a defect area management method of an optical recorder according to the present invention. Fig. 3 shows the contents of the data stored in the memory and the SDL pointer list.

Referring to FIGS. 4 and 5, a method of managing a defective area of an optical recorder according to the present invention will be described. First, as the disk 301 is inserted, DMA information of the disk 301 is retrieved, and the DMA list is stored. The information is stored in the section 306.

On the other hand, when the data is recorded on the disc 301 and when the data is reproduced, the method for managing the defective area is different. First, as a data recording command is received from the host 308 of the system, a process according to the data recording command is performed. Explain.

Upon receipt of the write command, the micom 305 obtains SDL information of the user area to be recorded from the DMA list storage 306. In this case, as shown in FIG. 4, the acquired SDL information includes position information of the defect blocks A, B, C, and D of the user area, and spare replacement blocks a, b, c, and the like corresponding to the defect block. The positional information of d) is recorded ((B, b), (C, c), (D, d), (A, a)).

As such, after acquiring the SDL information of the user area to be recorded, the data processor 302 performs data recording on the disc 301. On the other hand, with reference to the obtained SDL information, when the defective blocks (B, C, D, A) listed in the SDL are encountered while performing the writing, the SDL replacement block memory unit 307 stores data to be written in the defective block. ), And the record information is input to the SDL pointer list unit 304.

As shown in FIG. 5, the SDL pointer list unit 304 may include an address (a, b, c, d) of the replacement spare block and an address (1, 2, 3, 4) of the SDL replacement block memory unit. Information is recorded ((b, 1), (c, 2), (d, 3), (a, 4)).

On the other hand, after the process is performed, the data processor 302 continues to record data according to the received command. Accordingly, when the data write command is terminated from the host 308, the defective block (listed in the SDL with reference to the SDL pointer list section 304 is stored in the SDL replacement block memory section 307). The spare spare blocks a, b, c, and d correspond to A, B, C, and D.

Further, as the data reproducing command is received from the host 308 of the system, the processing procedure according to the data reproducing command will be described.

Upon receipt of the playback command, the micom 305 obtains SDL information of the user area block to be played back from the DMA list storage 306. In this case, as shown in FIG. 4, the acquired SDL information includes position information of the defect blocks A, B, C, and D of the user area, and spare replacement blocks a, b, c, and the like corresponding to the defect block. The positional information of d) is recorded ((B, b), (C, c), (D, d), (A, a)).

As such, after acquiring the SDL information of the user area block to be reproduced, using the SDL information, the spare spare blocks b, c, corresponding to the defective blocks B, C, D, and A listed in the SDL are used. The data stored in d, a) is reproduced, the data is stored in the SDL replacement block memory section 307, and the record information is input to the SDL pointer list section 304.

As shown in FIG. 5, the SDL pointer list unit 304 may include an address (a, b, c, d) of the replacement spare block and an address (1, 2, 3, 4) of the SDL replacement block memory unit. Information is recorded ((b, 1), (c, 2), (d, 3), (a, 4)).

On the other hand, after the above process is performed, the data processor 302 performs data reproduction from the disc 301. At this time, if a defective block (B, C, D, A) listed in the SDL is encountered while performing data reproduction from the disc 301, the SDL replacement block memory unit (Refer to the SDL pointer list unit 304) Data stored in 307 is transmitted to the host 308.

In addition, the data processor 302 transmits data stored in the SDL replacement block memory unit 307 to the host 308, and then continues to reproduce data according to a command received from the host 308.

As described above, the defect area management method of the optical recorder according to the present invention includes the steps of recording / reproducing data in the user area and processing data in the spare area in processing data of the defect area of the rewritable optical recording medium. By separating and processing the recording / reproducing step, there is an advantage that the data processing time can be shortened by reducing the movement of the servo.

Claims (4)

(a) receiving a data write command; (b) acquiring SDL information of a user area in which data is to be recorded, upon receiving the command, and performing data recording according to the command; (c) If the defective block listed in the SDL is encountered during data recording in the user area by using the SDL information obtained in the step (b), the data to be written in the defective block listed in the SDL is stored in the memory means. Making a step; (d) performing step (c) and continuing to record data in accordance with the data write command received in step (a); And (e) when the data recording command is completed, recording the data stored in the memory means into a spare spare block corresponding to the defective block listed in the SDL. . The method of claim 1, The storage in the memory means in the step (c) further includes a replacement spare block address corresponding to the defective block listed in the SDL, and address information stored in the memory means. Way. (a) receiving a data reproducing command; (b) acquiring SDL information of a user area to reproduce data; (c) using the SDL information obtained in step (b), reproducing the data recorded in the spare spare block corresponding to the defective block listed in the SDL, and storing the data in the memory means; (d) performing step (c) and transmitting data stored in the memory means when encountering a defective block listed in the SDL during data reproduction according to the data reproduction command received in step (a); And and (e) continuing to reproduce data according to the data reproduction command received in said step (a) after transferring the data stored in said memory means. The method of claim 3, wherein The storing in the memory means in the step (c) further includes a replacement spare block address corresponding to the defective block listed in the SDL, and address information stored in the memory means. How to manage.