KR100246478B1 - Apparatus and method for generating defect area management list - Google Patents

Abstract

The present invention relates to an apparatus and method for generating a defective area management list for managing a defective area of a rewritable disc medium.

The apparatus for generating a defect area management list according to the present invention includes a control unit for issuing a format command of a disc and controlling each unit, an encoder unit for encoding known data to be recorded at a specific inspection position when the format command is issued by the control unit, and an encoder unit. A physical position detector which reads data from the disc under control to determine the physical position of the disc, a servo and head unit which records the known position detected by the physical position detector by encoding known data; And a decoder section for reading the known data recorded in the data back into the head, decoding it to determine the defect, and a defect area management data storage section for storing the disk area information determined to be the defect.

Description

Apparatus and method for generating defect area management list

The present invention relates to a driver of a rewritable disk medium, and more particularly, to an apparatus and method for generating a defective area management list of a disk medium for managing a defective area.

Generally, a disk medium is classified into three types, such as a read-only ROM type, a write once type Worm type, and a rewritable type that can be repeatedly written, depending on whether repeat recording is possible. For example, a ROM type recording medium includes a compact disc read only memory (hereinafter referred to as a "CD-ROM") and a digital versatile disc read only memory (hereinafter referred to as "DVD"). -ROM ", and a WORM type recording medium include a recordable digital versatile disc (hereinafter referred to as" DVD-R "). In addition, freely repeatable rewritable discs include a rewritable compact disc (hereinafter referred to as "CD-RW") and a rewritable digital versatile disc (hereinafter referred to as "DVD-RW"). There is this.

On the other hand, in the case of a rewritable disc medium, the recording / reproducing operation of the information is repeatedly performed due to its use characteristics, whereby the mixing ratio of the mixture constituting the recording layer formed for recording the information on the disc medium is the initial mixing ratio. The characteristics of the optical recording medium are changed, and the characteristics thereof are lost, and an error occurs when recording / reproducing information. This is called degradation in an optical recording medium. The deteriorated area is represented as a defect area when a disk medium is formatted, recorded, or reproduced. In addition, a rewritable disc medium (CD-RW, DVD-RW) has a defect area due to deterioration, scratches on the surface, dust, dust, and manufacturing errors.

In addition, in order to prevent data from being recorded / reproduced in the defect area formed due to the above reasons, management of the defect area has become necessary. Accordingly, the disc media standard group recommends that the defective area management tables shown in Table 1 and Table 2 be included in the standard.

Here, PDL means a Primary Defect List (hereinafter referred to as “PDL”), and Table 1 shows the contents of the PDL table recorded in the defect management area of the optical recording medium.

In this case, the SDL means a defective data storage unit (hereinafter referred to as “SDL”), and Table 2 shows the contents of the SDL table recorded in the defect management area of the disk medium.

However, there is a need for an apparatus and method for generating a defect area management list for efficiently managing defect areas by using the defect area management table according to the recommendations of the disc media standard group.

Accordingly, an object of the present invention is to provide an apparatus and method for generating a defective area management list for managing a defective area of a disk medium.

1 is a block diagram showing a defect management apparatus of a disk medium according to the present invention.

2 is a flowchart illustrating a defect management method of a disk medium according to the present invention.

* Explanation of symbols for main parts of the drawings

10: Servo 12: Encoder

14 decoder 16 PID decoder

18: defective area management data storage unit 20: host interface

22: control unit 24: host

26: head

In order to achieve the above object, the apparatus for generating a defect area list according to the present invention includes a control unit which issues a format command of a disc and controls each unit, and an encoder which encodes known data to be recorded at a specific inspection position when the format command is issued by the control unit. And a physical position detection unit for reading data from the disc under control of the encoder unit to determine the physical position of the disc, and a servo and head for recording the known position encoded by the physical position detection unit. And a decoder section for reading the known data recorded at the inspection position into the head, decoding it to determine the defect, and a defect area management data storage section for storing the disk area information determined to be the defect.

In addition, the method for generating a defect area management list of a disc medium according to the present invention includes the steps of: transmitting a format command to a controller after mounting the disc medium; detecting a physical position of the disc by the format command; Encoding and recording known data at a position to be inspected according to the present invention, reproducing and decoding the recorded data, determining a disk defect region to be inspected according to the decoded result, and storing defect region information. do.

Other objects and features of the present invention other than the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.

A preferred embodiment of the present invention will be described with reference to FIGS. 1 to 2.

Referring to FIG. 1, a host 24 which issues a format command to a system, a controller 22 which controls each part according to the command of the host 24, and the host 24 and the controller 22 And a defect area management list generating device for a disk medium having a host interface 20 for connecting another device. The format command of the host 24 is transmitted to the controller 22 via the host interface 20. For example, when the host 24 issues a format command to the disk medium driver, the format command is transmitted to the control unit 22 via the host interface 20, and the control unit 22 according to the command of the host. ) Controls each part to execute the command of the host, and upon completion of the command, the command execution completion report is reported to the host 24. Meanwhile, the controller 22 performs an encoder 12, a decoder 14, a physical sector number (hereinafter referred to as a “PID”) decoder 16 and a defective area to execute a command from the host 24. Defect Management Area (hereinafter referred to as “DMA”) Data storage unit 18 is controlled.

In addition, the head unit 26 optically accesses the disk medium, the servo 10 performs focusing and tracking of the head unit under the control of the control unit 22, and encodes known information and / or defect area information. The apparatus for generating a defect area management list for a disc medium according to the present invention includes an encoder 12 and a PID decoder 16 for detecting a physical address of a position currently followed by the head 26. It is. The controller 22 controls the encoder 12 to perform a format command by the host's format command transmitted to the controller 22. In detail, the controller 22 calculates a position to be moved according to a format command from the host 24 and controls the head 26 to move to a desired position. In addition, the physical address corresponding to the current moving position of the head 26 moving in the PID decoder 18 is detected. In addition, the encoder 12 encodes the already known information and / or defect area information into a format required by the disc medium (for example, '0' or '1') under the control of the control unit 22, and then performs the head. The section 26 is used to record on the disk medium.

In addition, a decoder 14 for decoding the known data recorded on the disk medium in its original form and comparing the known data with each other, and a DMA for storing physical sector numbers of a defective area on the disk medium. An apparatus for generating a defective area management data storage portion of a disk medium according to the present invention, which comprises a data storage portion 18, is shown. On the other hand, the known data recorded on the disk medium is restored to its original form at the decoder 14, and in the process, the decoder 14 compares the known data with each other and, if the data is different from the known data, the defect on the disk medium. It is recognized that the data is present, and the physical sector number of the corresponding point is stored in the DMA data storage unit. In detail, the encoder 12 restores the known data to the original form in the decoder 14 and compares them with each other to recognize that a defective area exists on the disk medium. can do. In addition, the decoder 14 repeatedly restores and compares the data, and stores the physical sector numbers of the defective areas on the disk medium in the DMA data storage unit 18. The encoder 12 sequentially records the physical sector numbers of the defective area stored in the DMA data storage 18 in the read in area and read out area of the disc medium. As a result, the physical sector numbers (i.e., defect area management list) of the defective area on the disk medium detected by the format command of the host 24 are recorded on the disk medium so as to be defective in performing the recording / reproducing command on the disk medium. Used for area management.

A method of generating a defect area management list of a disk medium according to the present invention will be described with reference to FIG.

A defect area management method of a disc medium includes a thirty-one step of determining whether a disc medium is mounted and a type, and a thirty-second step of issuing a format command from the control unit 24. Whether or not the disk medium is mounted is determined by the level of the high frequency signal detected by the head part 26 performing the focusing operation. The type of disc medium is determined by the head part 26 moving in the track direction of the disk medium. It is determined whether the disc medium is a rewritable disc medium by comparing the tracking signal detected in the process of returning to the predetermined signal level. From the host 24, a command (for example, a format command) to be executed in the driver apparatus of the disk medium is transmitted to the controller 22 in the driver apparatus via the host interface 20. Meanwhile, the controller 22 controls the encoder 12, the decoder 14, the PID decoder 16, and the DMA data storage unit 18 to perform a format command of the host 24.

The method further includes a thirty-third step of detecting a physical position of the disc by a format command, and a thirty-fourth step of encoding already known data according to the position detection. In order to perform the format command from the control unit 22, the PID decoder 16 detects the physical position of the disc, and the encoder 12 controls to record the information already known on the disc medium.

The method further includes a thirty-five step of reproducing and decoding the data recorded on the disc medium, and determining a defective area of the disc according to the decoded result and recording the defective area information in the DMA data storage 18. do. The decoder 14 restores the known data recorded on the disk medium to its original form, and compares the data recorded on the disk medium with the restored data to determine whether the corresponding sector is defective. At this time, if the two data are different from each other, it is recognized that a defective area exists in the disk medium, and the physical sector number of the defective area is recorded in the DMA data storage unit 18.

A thirty-eighth step includes repeating the steps 33 to 36 to check whether all sectors of the disc medium are defective and the thirty-seventh step of reporting command completion. In step 33 to 36, after determining whether a part of the disk medium is defective or not, it is repeatedly performed to check whether all sectors of the disk medium are defective. The defects of all the areas of the disc medium are checked and the physical sector numbers of the defective areas which are recognized as existing on the disc medium are sequentially stored in the DMA data storage unit 18. In addition, after recording the physical sector numbers of the defective areas stored in the DMA data storage unit 18 in the read-in area and read-out area of the disk medium, the microcomputer 22 reads the host 24. ) Report the completion of command and finish the operation. As a result, the physical sector numbers (i.e., defect area management list) of the defective area on the disk medium detected by recording / reproducing the known data in all sectors by the format command of the host 24 are stored in the DMA data storage unit ( 18), the physical sector number of the defective area stored in the DMA data storage 18 is recorded on the disk medium, so that the defective area management list is a defective area when the information recording / reproducing command is executed. Used for management.

As described above, the apparatus and method for generating a defective area list of the optical recording medium of the present invention records the physical sector number of the defective area on the disk medium on the disk medium, thereby efficiently recording the defective area when recording / reproducing information. There is an advantage to manage.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (11)

A control unit for issuing a format command of the disc and controlling each unit; an encoder unit for encoding known data to be recorded at a specific inspection position when the format command is issued by the control unit; and reading data from the disc under control of the encoder unit. A physical position detection unit for determining a physical position of the servo, a servo and head unit for recording the inspection position detected by the physical position detection unit with the encoded known data, and a known data recorded at the inspection position. And a defect area management data storage unit for storing the disc area information determined as the defect and the decoder unit for determining the defect by reading the data again. The apparatus of claim 1, wherein the controller transmits a format command received from a host to the encoding unit. The apparatus as claimed in claim 1, wherein the controller comprises a host interface for transmitting and receiving data with a host. After mounting the disk medium, transmitting a format command to the control unit; detecting a physical position of the disk by the format command; and encoding and recording known data at a position to be inspected according to the position detection. And reproducing and decoding the recorded data, and determining a disc defective area to be inspected according to the decoded result and storing the defective area information. 5. The defect area management according to claim 4, wherein the defect area discrimination is performed by comparing known data recorded at an inspection position of an arbitrary unit with data reproduced at the same position to determine whether a defect region is at an inspection position. How to create a list. 5. The method as claimed in claim 4, wherein the storing of the defective area information stores a physical sector number which is a physical location of a disc determined as a defective area. 5. The defect area management list generation according to claim 4, wherein the defect area discrimination is performed by comparing the data reproduced in the same block unit area with known data recorded at an inspection position of an arbitrary block unit area to determine a defect area. Way. 8. The method of claim 7, wherein the defective area information is a physical sector number which is a starting physical position of a block unit area determined as a defective area. 10. The method of claim 8, wherein the defective area information includes a starting physical position of a normal block unit area of a disk to replace the block unit area determined as the defective area. 5. The method as claimed in claim 4, wherein the defect area information is recorded again in a specific area of the disc. 11. The method as claimed in claim 10, wherein the recording of the defective area information is performed after determining the defective area for all positions of the disc.

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