KR19990052628A - Defective Area Management Apparatus and Method for Optical Recording Media - Google Patents

Abstract

The present invention relates to an apparatus and method for managing a defect area of an optical recording medium for managing a defect area of a rewritable optical recording medium.

An apparatus for managing a defect area of an optical recording medium according to the present invention includes a defect area management data storage for storing defect area information recorded on an optical recording medium, a physical ID decoder for detecting a physical address of a position currently tracked by a pickup; A defect area management comparator for comparing the information of the defect area management data storage unit with the physical ID decoder, an encoder for encoding data into a format required by the optical recording medium under the control of a microcomputer, and a control of the microcomputer. And a decoder for restoring the data recorded on the optical recording medium to its original form.

Description

Apparatus of Defect Area Management for Optical Recording Media and Method of The Same

The present invention relates to a driver of a rewritable optical recording medium, and more particularly, to an apparatus and method for managing a combined area of an optical recording medium for managing a defective area.

In general, optical recording media can be classified into three types such as read-only ROM, write-once worm type, and rewritable rewritable type. . For example, a ROM type recording medium may include a compact disc read only memory (CD-ROM) and a digital versatile disc read only memory (DVD). -ROM ", etc., and a worm-type recording medium include a recordable compact disc (hereinafter referred to as" CD-R ") and a recordable digital multi-function disc (Recordable Digital). Versatile Disc: hereinafter referred to as "DVD-R"). In addition, freely repeatedly 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 optical recording medium, the recording / reproducing operation of information is repeatedly performed due to the use characteristics thereof. As a result, the mixing ratio of the mixture constituting the recording layer formed for recording the information on the optical recording medium is increased. It is different from the mixing ratio and loses its characteristics, resulting in an error in recording / reproducing information. This is called degradation in an optical recording medium. The deteriorated area is represented as a defect area when the format, recording, and reproducing command of the optical recording medium is executed. In addition, a rewritable optical recording 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 optical recording medium standard group recommends that the defect area management tables shown in Tables 1 and 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.

Here, 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 optical recording medium.

However, there is a need for a defect area management apparatus and method for efficiently managing a defect area of an optical recording medium by using the defect area management table according to the recommendation of the optical recording medium standard group.

Accordingly, it is an object of the present invention to provide a defective area recording / reproducing apparatus which efficiently corresponds to a defective area of an optical recording medium.

A defect area management apparatus and method for efficiently managing a defect area of an optical recording medium are provided.

Figure 1a is a block diagram showing a defect area management apparatus according to the present invention.

1B is a diagram showing the structure of a defect management area comparator of FIG. 1A;

2 is a flowchart illustrating a defect area management method according to the present invention;

* Explanation of symbols for main parts of the drawings

10: Servo 12: Encoder

14: Decoder 16: Physical ID Decoder

18: defect management area data storage

20: host interface 22: microcomputer

24: host 26: pickup

28: Defective Area Management Comparator

In order to achieve the above object, a defect area recording apparatus of an optical recording medium according to the present invention includes a defect area management data storage for storing defect area information recorded on an optical recording medium, and a physical address of a position currently tracked by a pickup. A physical ID decoder for detecting, a defect area management comparator for comparing the information of the defect area management data storage unit and the physical ID decoder, and an encoder for encoding data into a format required by the optical recording medium under the control of a microcomputer; do.

An apparatus for reproducing a defective area of an optical recording medium according to the present invention includes a defect area management data storage for storing defect area information recorded on an optical recording medium, a physical ID decoder for detecting a physical address of a position currently tracked by a pickup; A defect area management comparator for comparing the information of the defect area management data storage unit with the physical ID decode, and a decoder for restoring the data recorded on the optical recording medium under the control of the microcomputer to its original form.

An apparatus for managing a defect area of an optical recording medium according to the present invention includes a defect area management data storage for storing defect area information recorded on an optical recording medium, a physical ID decoder for detecting a physical address of a position currently tracked by a pickup; A defect area management comparator for comparing the information of the defect area management data storage unit with the physical ID decoder, an encoder for encoding data into a format required by the optical recording medium under the control of a microcomputer, and a control of the microcomputer. And a decoder for restoring the data recorded on the optical recording medium to its original form.

In addition, a method for managing a defective area of an optical recording medium according to the present invention includes a first step of storing physical sector numbers of a defective area recorded on the optical recording medium in a defect area management data storage after mounting the optical recording medium; A second step of inputting a recording / reproducing command from the host, and converting the logical sector number included in the command into a physical address in a microcomputer to perform the recording / reproducing command, A third step of storing the physical sector number, a fourth step of operating the servo under the control of the microcomputer and detecting the physical address in the physical ID decoder, the physical sector number of the original defective area and the data detected in the physical ID decoder If the two data does not match each other in the fifth step and the fifth step of determining whether the After the recording / reproducing command for the current width is completed, the sixth step of increasing the width for executing the command by one, and the width of the command for performing the command are included in the recording / reproducing command. A seventh step of determining whether or not a coincidence is greater than the length of the pre-determined width, and an eighth step of terminating the execution of the command in the microcomputer and reporting the completion of the command to the host if the width of the command executed in the seventh step is large. Include.

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.

With reference to Figures 1 to 2 will be described a preferred embodiment of the present invention.

Referring to FIG. 1, a host 24 that issues a recording / playback command to a system, a microcomputer 22 that controls each part in accordance with a command of the host 24, the host 24, and a microcomputer An apparatus for managing a defect area of an optical recording medium having a host interface 20 connecting 22 and another device is shown. The command of the host 24 is transmitted to the microcomputer 22 via the host interface 20. For example, when the host 24 issues a read / write command to the driver, a recording includes information about a logical sector number (hereinafter referred to as "LSN") and a length to be performed. The / playback command is transmitted to the microcomputer 22 via the host interface 20, and according to the recording / playback command of the host 24, the microcomputer 22 controls each part to command the host 24. When the command execution ends, the command execution completion is reported to the host 24. On the other hand, the microcomputer 22 is a servo 10, encoder 12, decoder 14, physical sector (hereinafter referred to as "PID") decoder to perform a command from the host 24 ( 16) and a defect management area comparator 28 or the like.

In addition, a decoder (Decoder) 14 for restoring the data recorded on the optical recording medium to its original form, a DMA data storage unit 18 for storing the physical sector number of the defective area, the PID decoder 16, An apparatus for managing a defect area of an optical recording medium having a DMA comparator 28 for discriminating a defect area from information of the DMA data storage 18 is shown.

The DMA data storage unit 18 stores the DMA information recorded in the read-in area and read-out area of the optical recording medium, and then, upon request of the DMA comparator 28, Update the DMA information. On the other hand, the data recorded on the optical recording medium is restored by the decoder 14, and at this time, the physical address of the optical recording medium following the pickup is detected by the PID decoder 16 and transmitted to the DMA comparator 28. In detail, when the optical recording medium is mounted, the DMA information recorded in the lead-in area and the lead-out area on the optical recording medium is recorded in the DMA data storage unit 18 implemented as a memory device. On the other hand, the DMA comparator 28 compares the physical sector number of the defective area sequentially stored in the DMA data storage 18 with the physical address transmitted from the PID decoder 18, and stored in the DMA comparator 28. If the physical sector number of the defective area and the physical address followed by the current pickup match, the microcomputer 22 controls the servo 10 to cause the pickup to jump to the defective area. If the physical address of the PID decoder 16 and the physical sector number of the defective area stored in the DMA comparator 28 do not coincide with each other, the pickup performs reproduction from the next area of the jumped defective area. In addition, the DMA comparator 28 is implemented as a register, and 23 bits for storing the physical sector number of the defective area (ie, PSN_DMA [i]) and one bit for distinguishing the PDL from the SDL and six bits. It consists of a total of 32 bits with spare bits. The configuration of the DMA comparator 28 at this time is shown in FIG. 1B.

A pick-up 26 for optically accessing the optical recording medium, a servo 10 for focusing and tracking the pickup, an encoder 12 for encoding data in a format required by the optical recording medium, and And a defect area management apparatus for an optical recording medium having a physical ID (Physical Sector Number) decoder 16 for detecting a physical address of a position currently tracked by the pickup 26 is shown. have.

By the recording command of the host 24 transmitted to the microcomputer 22, the microcomputer 22 controls the encoder 12 to convert the information into a form required by the optical recording medium to perform the recording command. In detail, the tracking address of the current pickup 26 transmitted from the PID decoder 18 is detected and transmitted to the DMA comparator 28. The microcomputer 22 controls the servo 10 by calculating information of the LSN included in the host command and the length to be performed, and moves the pickup 26 in accordance with the command.

After moving the pickup 26 to a desired position, the encoder 12 converts the data into a format required by the optical recording medium and records the data on the optical recording medium using the pickup 26.

When the encoder 12 performs the write command, the PID encoder 16 and the DMA data storage unit 18 compare the physical addresses in the DMA comparator 28 to match the defective area, thereby jumping the combined area. . If the defective area does not appear, the recording command is executed from the next area after jumping the defective area. Since the operation of the DMA comparator 28 is the same as that described in the decoder 14, detailed description thereof will be omitted.

A method of managing a defective area of an optical recording medium according to the present invention will be described with reference to FIG.

A defect area management method of an optical recording medium includes a thirty-one step of determining whether an optical recording medium is mounted and a type thereof, and a thirty-second step of storing defect area information on the optical recording medium in the DMA data storage unit 18. The mounting of the optical recording medium is determined by the level of the high frequency signal detected while performing the focusing operation of the pickup. The determination of the type of the optical recording medium returns to the original position after the pickup moves in the track direction of the optical recording medium. By comparing the detected signal level with the tracking signal detected while performing the operation, it is determined whether the optical recording medium is a rewritable optical recording medium. When the mounting of the optical recording medium is completed, the DMA data storage unit 18 stores the defect area physical sector numbers (i.e., defect area information recorded on the optical recording medium in the format operation) recorded in the lead-in area and the lead-out area of the optical recording medium. Are stored in. On the other hand, when the optical recording medium is not mounted, the initial state is maintained.

In addition, the host 24 inputs a recording / reproducing command (step 33), converts the LSN into a physical address, and inputs the physical sector number (i.e., PSN_DMA [i]) of the first defective area into the DMA comparator 28; A thirty-fourth step of recording; The command to be executed in the driver device from the host 24 (for example, a recording / reproducing command) includes information about a logical sector number (hereinafter referred to as "LSN") and a length of data to be performed. It is. If the command is a recording command, the encoder 12 converts the data into a format required by the optical recording medium, and then uses the pickup 26 to record information as long as the data length to perform the recording command. On the other hand, in the case of the reproduction command, the decoder 14 converts the signal detected from the optical recording medium to the original form by using the pickup to restore the information by the length of the data to perform the reproduction command.

On the other hand, the microcomputer 22 converts a logical sector number (hereinafter referred to as "LSN") into a physical address (hereinafter referred to as "PSN"). The conversion process includes obtaining a physical initial position (hereinafter referred to as "prePSN") and obtaining a physical address. In detail, the physical initial position (prePSN) can be obtained by adding an address of a user area (for example, 31000h) to the LSN and the number of unused parts (X), and the physical address is a DMA offset to prePSN. ) To get it. This causes the microcomputer 22 to translate the current logical sector number into a physical address. On the other hand, the DMA comparator 28 stores the physical sector number of the first defective area among the information recorded in the DMA data storage 18.

In addition, a thirty-five step of operating the servo under the control of the microcomputer 22 and reproducing the data detected by the PID decoder 16 is included. By the address included in the recording / reproducing command and the length information to be performed, the microcomputer 22 controls the servo 10 to move the pickup 26 to the position to actually move. On the other hand, the PID decoder 16 detects the physical ID (PID) that the current pickup 26 follows and transmits it to the DMA comparator 28.

In addition, the DMA comparator 28 determines whether the physical sector number (that is, PSN_DMA [i]) matches the physical address transmitted from the PID decoder 18, and matches the defective area in the 36th step. In this case, after jumping the defective area, the DMA comparator 28 updates the physical sector numbers sequentially recorded in the DMA data storage 18 (i.e., PSN_DMA [i], i = i + 1), and then returns to the 35th. A thirty-seventh step performing steps 36 through 36 is included.

The DMA comparator 28 compares the physical address detected by the PID decoder 16 with the physical address of the defective area. On the other hand, when the physical address detected by the PID decoder 16 and the sector number of the defective area coincide, the defective area is jumped without performing the recording / reproducing operation in the defective area. In addition, the DMA comparator 28 updates the next physical sector number recorded in the DMA data storage 18, jumps in the defective area, and then executes the recording / reproducing operation from the address again.

In addition, in step 36, if it does not coincide with the defective area, step 38 includes performing a recording / reproducing command for one width. If it does not coincide with a defective area, a recording / reproducing command is performed for one width to complete recording / reproducing for one width.

The method further includes a thirty-sixth step of increasing the width for performing the recording / reproducing command one by one; It is determined whether the length of the width at that time is greater than the length of the width included in the command while increasing the length of the width included in the recording / reproducing command from the host 24 by one.

In addition, when the length is smaller than the width to be performed in step 40, the operation in the 41st step to perform steps 35 to 40 and when the length is larger than the width to be performed in step 40, the execution of the command is terminated. And the forty-second step of reporting completion of performance. When the length of the width is less than or equal to the length included in the command, steps 35 to 40 are repeatedly performed. On the other hand, when the length of the width is larger than the length included in the command, the microcomputer 22 terminates the execution of the recording / playback command and reports the command execution completion to the host 24.

As described above, the method and apparatus for determining a defective area of the optical recording medium of the present invention compare the physical addresses of the DMA data storage unit and the PID decoder in a DMA comparator while performing a recording / reproducing command from the host. In this case, the defective area jumps and the recording / reproducing command is executed again from the next area where the defective area does not exist, and thus the data recording / reproducing command is not executed in the defective area of the optical recording medium. There is an advantage to manage the area efficiently.

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 host for giving a recording command to the optical recording medium driver device, a microcomputer for controlling each part to perform a recording command from the host, a pickup for optically accessing the optical recording medium, and a control of the microcomputer. A recording apparatus having a defect area management function having a servo for focusing and tracking pickup by means of: a defect area management data storage for storing defect area information recorded on the optical recording medium, and the pickup being currently tracked; A physical ID decoder for detecting a physical address of a location; a defect area management comparator for comparing information of the defective area management data storage unit and a physical ID decoder; and the optical recording medium An encoder for encoding in a desired format Do area management apparatus. A host for giving reproduction commands to the optical recording medium driver device, a microcomputer for controlling each part to perform a recording command from the host, a pickup for optically accessing the optical recording medium, and a control of the microcomputer. A reproducing apparatus having a defect area management function having a servo for focusing and tracking pickup by means of: a defect area management data storage for storing defect area information recorded on the optical recording medium; A physical ID decoder for detecting a physical address of a position of a location; a defect area management comparator for comparing the information of the defect area management data storage unit and the physical ID decoder; and data recorded on an optical recording medium under control of the microcomputer. A defect comprising: a decoder for restoring Station management device. A host for issuing a recording / reproducing command to an optical recording medium driver device, a microcomputer controlling each part to perform a recording command from the host, a pickup for optically accessing the optical recording medium, and A defect area management apparatus having a servo for focusing and tracking pickup by control, comprising: a defect area management data storage for storing defect area information recorded on the optical recording medium, and a position currently tracked by the pickup; A physical ID decoder for detecting a physical address of a physical address, a defective area management comparator for comparing the information of the defective area management data storage unit and the physical ID decoder, and the optical recording medium requests data under the control of the microcomputer Under the control of the microcomputer And a decoder for recovering the data recorded on the optical recording medium in its original form. The defect area management apparatus of claim 3, wherein the defect area management data storage unit is implemented as a memory device. 4. The defect area management apparatus according to claim 3, wherein the defect area management comparator is implemented with a resist. A first step of storing physical sector numbers of the defective areas recorded on the optical recording medium in the defect area management data storage after mounting the optical recording medium, a second step of inputting a recording / reproducing command from the host; A third step of converting a logical sector number included in the command into a physical address and storing the physical sector number of the first defective area in a defective area management comparator in order to perform the recording / reproducing command; A fourth step of operating the servo under control of the control unit and detecting a physical address in the physical ID decoder; and determining a match between the physical sector number of the first defective area and the data detected by the physical ID decoder; If the two data do not coincide with each other in step 5, the current recording is performed by executing a recording / reproducing command for the current width. After completion of the recording / reproducing command for the width of, the sixth step of increasing the width of the command execution step by step, and whether the width of the command for performing the command is larger than the length of the width included in the recording / reproducing command; And a seventh step of determining, and an eighth step of terminating the execution of the command in the microcomputer and reporting the completion of the command to the host when the instruction is executed in the seventh step is large. How to manage. The method according to claim 6, wherein if the defect area coincides with the fifth step, after jumping the defect area, the physical sector numbers of the defect areas stored in the defect area management data storage unit are sequentially updated in the defect area management comparator. And a ninth step of performing the fourth to fifth steps. 7. The method as claimed in claim 6, further comprising a tenth step of performing the fourth to seventh steps when the width is smaller than the width of the seventh step. The method of claim 8, wherein the first step includes determining whether the optical recording medium is mounted, and storing physical sector numbers of the defective area recorded on the optical recording medium in a defect area management data storage unit. Defective area management method comprising the. 10. The method as claimed in claim 9, wherein when the optical recording medium is not mounted in the determining whether the optical recording medium is mounted, the defect area management method returns to an initial state. 9. The method of claim 8, wherein the third step comprises: converting a logical sector number included in the command into a physical address in the microcomputer, and storing the physical sector number of the first defective area in the defective area management comparator. Defect area management method characterized by a feather comprising a.