JP2002056619A - Disk drive device and data storing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce seek operation to an exchange area in the case of reading data. SOLUTION: It is discriminated whether or not a boaded disk has been subjected to exchange processing (S001 and S002). When the disk is discriminated to have been subjected to exchange processing, it is discriminated whether or not an instruction (e.g. recording, reproduction, etc.), from a host computer is carried out (S003), and when the instruction is discriminated not to be carried out, an exchange sector is accessed, and exchange data are reproduced and stored in a cache memory (S004 and S005).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive capable of reading data recorded on a disk-shaped recording medium such as an optical disk, and a data storage method for storing the read data in a memory. It is about.

[0002]

2. Description of the Related Art Recordable optical disks such as CD-Rs and CD-RWs are known. In such an optical disc, data is recorded by irradiating the recording area with a laser beam. However, in the recording area, a defect in the production of the disc or a scratch generated after the production has occurred. A defective area where data cannot be recorded / reproduced occurs due to contamination or dirt. Therefore, in order to compensate for the loss of recording capacity due to this defective area,
A replacement recording area (replacement area) is secured. Therefore, data that would have been originally written in the defective area can be recorded in the spare area, and all desired data is recorded on the disk.

[0003]

However, when reading a file, if a part of the data constituting the file is recorded in the spare area, the data is recorded from the recording area to the spare area and from the spare area to the recording area. In order to access the area, a seek operation of the optical pickup will occur. As a result of this seek operation, data reading is temporarily interrupted, and reading data is not transferred during that time. Therefore, there is a problem that the transfer rate of reproduction data is reduced.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides processing means capable of executing various kinds of processing on a loaded disk based on an external command, Detecting means for detecting, from a disk, identification information capable of identifying whether or not a replacement process is performed on the disk; data recorded in a recording area of the disk, or replacement by the replacement process Reading means for reading replacement data recorded in the area, memory capable of storing data read by the reading means, and disc information based on the identification information detected by the detecting means. When it is determined that the replacement process is being performed and the process by the processing unit is not being performed, the replacement is performed from the replacement area. It reads the chromatography data, constituting the disc drive device provided with a storage control unit that can be stored in the memory.

[0005] Further, a step of detecting, from the loaded disk, identification information capable of identifying whether or not a replacement process has been performed on the disk, a step of detecting data recorded in a recording area of the disk. Or a step of reading replacement data recorded in a replacement area by the replacement process, a step of storing data read from the recording area based on an external command in a first area of a memory, and And storing the replacement data read from the replacement area in the second area of the memory when the processing based on the instruction is not performed.

According to the present invention, since the replacement data is stored in the memory in advance, the replacement data can be read from the memory when the replacement data is read. Therefore, even when reading a file in which a part of the data is recorded in the spare area, the spare data can be read without performing a seek operation on the spare area. Further, since the normal read data and the replacement data are identified and stored in the memory, the normal read data and the replacement data can be individually handled.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in the following order. 1. 1. Configuration of disk drive device 2. Subcode and TOC Replacement management 4. Playback processing

[0008] 1. Configuration of Disk Drive Apparatus CD-R is a write-once medium using an organic dye for a recording layer, and CD-RW is a data rewritable medium using a phase change technique. CD-
FIG. 1 shows a configuration of a disk drive device of the present example capable of recording and reproducing data on a CD type disk such as R, CD-RW or the like. In FIG. 1, the disk 90 is a CD-R or a CD-RW. CD-D
A (CD-Digital Audio), CD-ROM, and the like can also be reproduced as the disc 90 here.

The disk 90 is mounted on the turntable 7 and is driven by the spindle motor 1 during recording / reproducing operation at a constant linear velocity (CLV) or a constant angular velocity (CA).
V). Then, pit data (phase change pits or pits due to organic dye change (reflectance change)) on the disk 90 is read by the optical pickup 1. In the case of a CD-DA or a CD-ROM, the pits are embossed pits.

In the pickup 1, a laser diode 4 serving as a laser light source, a photodetector 5 for detecting reflected light, an objective lens 2 serving as an output end of the laser light,
An optical system (not shown) for irradiating the laser beam to the disk recording surface via the objective lens 2 and guiding the reflected light to the photodetector 5 is formed. A monitor detector 22 that receives a part of the output light from the laser diode 4
Is also provided.

The objective lens 2 is held by a biaxial mechanism 3 so as to be movable in a tracking direction and a focusing direction. The entire pickup 1 can be moved in the disk radial direction by a thread mechanism 8. The laser diode 4 in the pickup 1 is driven to emit laser light by a drive signal (drive current) from a laser driver 18.

The information on the reflected light from the disk 90 is detected by the photodetector 5, converted into an electric signal corresponding to the amount of received light, and supplied to the RF amplifier 9. Note that the amount of light reflected from the disc 90 varies greatly before and after recording data on the disc 90, during recording, or the like. An AGC circuit is generally mounted on the RF amplifier 9 due to circumstances such as being greatly different from ROM and CD-R.

The RF amplifier 9 includes a current-voltage conversion circuit, a matrix operation / amplification circuit, and the like corresponding to output currents from a plurality of light receiving elements as the photodetector 5, and generates necessary signals by matrix operation processing. For example, it generates an RF signal as reproduction data, a focus error signal FE for servo control, a tracking error signal TE, and the like. The reproduction RF signal output from the RF amplifier 9 is supplied to a binarization circuit 11, and the focus error signal FE and the tracking error signal TE are supplied to a servo processor 14.

On the disk 90 as a CD-R or CD-RW, a groove (groove) serving as a guide for a recording track is formed in advance, and the groove has time information indicating an absolute address on the disk. The signal is wobbled (meandering) by the FM-modulated signal. Therefore, during the recording operation, tracking servo can be applied from the information on the groove, and the absolute address can be obtained from the wobble information on the groove. RF
The amplifier 9 performs wobble information WO by matrix operation processing.
B is extracted and supplied to the address decoder 23.
In the address decoder 23, the supplied wobble information W
By demodulating the OB, absolute address information is obtained and supplied to the system controller 10. Also, the groove information is P
By injecting into the LL circuit, the rotational speed information of the spindle motor 6 is obtained, and further compared with the reference speed information,
A spindle error signal SPE is generated and output.

The reproduced RF signal obtained by the RF amplifier 9 is 2
The signal is binarized by the value conversion circuit 11 to be a so-called EFM signal (8-14 modulated signal), which is supplied to the encoding / decoding unit 12. The encoding / decoding unit 12 includes a functional part as a decoder during reproduction and a functional part as an encoder during recording. During reproduction, processing such as EFM demodulation, CIRC error correction, deinterleaving, and CD-ROM decoding are performed as decoding processing.
The reproduction data converted into the ROM format data is obtained. Further, the encoding / decoding unit 12 is provided with a disk 90
The sub-code extraction process is also performed on the data read from the sub-system, and the TOC and address information as the sub-code (Q data) are supplied to the system controller 10. Further, the encoding / decoding unit 12 generates a reproduction clock synchronized with the EFM signal by PLL processing,
The decoding process is executed based on the reproduced clock. The rotational speed information of the spindle motor 6 is obtained from the reproduced clock, and is compared with the reference speed information to generate a spindle error signal SPE. it can.

At the time of reproduction, the encoding / decoding unit 12
Accumulates the data decoded as described above in the buffer memory 20. As a reproduction output from the disk drive device, data buffered in the buffer memory 20 is read and transferred and output.

The interface unit 13 is connected to an external host computer 80, and is connected to the host computer 80.
The communication of recording data, reproduction data, various commands, and the like is performed with the communication device. Actually, SCSI, ATAPI interface and the like are adopted. At the time of reproduction, the reproduced data decoded and stored in the buffer memory 20 is transferred and output to the host computer 80 via the interface unit 13. Note that a read command, a write command, and other signals from the host computer 80 are supplied to the system controller 10 via the interface unit 13.

The cache memory 30 is provided as a memory capable of temporarily storing data read from the disk 90 based on a request from the host computer 80. For example, by storing frequently requested data, when the host computer 80 requests the data, the data is read out from the cache memory 30 so that the data transfer is performed at a higher speed than the data read out from the disk 90. Will be able to do it. Further, in the present embodiment, when the replacement process is performed on the loaded disk 90, the processing based on the instruction from the host computer 80 is not executed, that is, when the required processing on the disk 90 is The replacement data recorded in the replacement area can be stored.

On the other hand, at the time of recording, the host computer 8
Recording data (audio data or CD-ROM data) is transferred from 0, and the recording data is sent from the interface unit 13 to the buffer memory 20 and buffered. In this case, the encoding / decoding unit 1
2 is a process for encoding CD-ROM format data into CD format data (when supplied data is CD-ROM data), CIRC encoding and interleaving, adding subcode, Executes EFM modulation and the like.

The EFM signal obtained by the encoding process in the encoding / decoding unit 12 is sent to the laser driver 18 as a laser drive pulse (write data WDATA) after a waveform adjustment process is performed in the write strategy 21. In the write strategy 21, recording compensation, that is, fine adjustment of the optimum recording power with respect to the characteristics of the recording layer, the spot shape of the laser beam, the recording linear velocity, and the like is performed.

In the laser driver 18, the write data WD
A laser drive pulse supplied as ATA is supplied to the laser diode 4 to perform laser emission driving. As a result, pits (phase change pits and dye change pits) corresponding to the EFM signal are formed on the disk 90.

APC circuit (Auto Power Control) 19
Is a circuit unit for controlling the laser output power by monitoring the output of the monitoring detector 22 so that the laser output becomes constant irrespective of the temperature or the like. The target value of the laser output is provided from the system controller 10, and the laser driver 18 is controlled so that the laser output level becomes the target value.

The servo processor 14 detects the focus, tracking, thread, and spindle from the focus error signal FE and the tracking error signal TE from the RF amplifier 9 and the spindle error signal SPE from the encode / decode unit 12 or the address decoder 20. Generate various servo drive signals and execute servo operation. That is, the two-axis driver 1 generates the focus drive signal FD and the tracking drive signal TD according to the focus error signal FE and the tracking error signal TE.
6 The two-axis driver 16 drives the focus coil and the tracking coil of the two-axis mechanism 3 in the pickup 1. As a result, a tracking servo loop and a focus servo loop are formed by the pickup 1, the RF amplifier 9, the servo processor 14, the two-axis driver 16, and the two-axis mechanism 3.

Further, in response to a track jump command from the system controller 10, the tracking servo loop is turned off and a jump drive signal is output to the two-axis driver 16 to execute a track jump operation.

The servo processor 14 further sends a spindle error signal S to the spindle motor driver 17.
A spindle drive signal generated according to the PE is supplied. The spindle motor driver 17 applies, for example, a three-phase drive signal to the spindle motor 6 in response to the spindle drive signal, and controls the CLV rotation of the spindle motor 6 or CA.
Execute V rotation. In addition, the servo processor 14 generates a spindle drive signal in response to a spindle kick / brake control signal from the system controller 10, and causes the spindle motor driver 17 to execute operations such as starting, stopping, accelerating, and decelerating the spindle motor 6.

The servo processor 14 generates a thread drive signal based on, for example, a thread error signal obtained as a low-frequency component of the tracking error signal TE or an access execution control from the system controller 10 and supplies the thread drive signal to the thread driver 15. I do. The thread driver 15 drives the thread mechanism 8 according to a thread drive signal. Although not shown, the thread mechanism 8 includes
A mechanism including a main shaft for holding the pickup 1, a thread motor, a transmission gear, and the like is provided.
, The required sliding movement of the pickup 1 is performed.

The various operations of the servo system and the recording / reproducing system as described above are controlled by a system controller 10 formed by a microcomputer. The system controller 10 executes various processes according to a command from the host computer 80. For example, when a read command requesting transfer of certain data recorded on the disk 90 is supplied from the host computer 80,
First, seek operation control is performed for the designated address. That is, a command is issued to the servo processor 14 to execute the access operation of the pickup 1 targeting the address specified by the seek command. afterwards,
An operation control necessary for transferring the data in the designated data section to the host computer 80 is performed. That is, data reading / decoding / buffering from the disk 90 is performed, and the requested data is transferred.

When a write command (write command) is issued from the host computer 80, the system controller 10 first picks up the pickup 1 at the address to be written.
To move. Then, the encoding / decoding unit 12 causes the data transferred from the host computer 80 to perform the encoding process as described above.
FM signal. Then, as described above, the recording is executed by supplying the write data WDATA from the write strategy 21 to the laser driver 18.

2. Subcode and TOC The TOC and the subcode recorded in the lead-in area on the CD format disc will be described. The minimum unit of data recorded on a CD disk is one frame. One block is composed of 98 frames.

The structure of one frame is as shown in FIG. 1
The frame is composed of 588 bits. The first 24 bits are used as synchronization data, and the following 14 bits are used as a subcode data area. After that, data and parity are allocated.

One frame is composed of 98 frames, and the subcode data extracted from the 98 frames are collected to form one block of subcode data (subcoding frame) as shown in FIG. ) Is formed. First and second frames at the beginning of 98 frames (frame 98n + 1, frame 98n + 2)
Is a synchronization pattern.
Then, from the third frame to the 98th frame (frame 9
8n + 3 to frame 98n + 98), each of which has 96 bits of channel data, that is, P, Q, R, S, T, U,
V and W subcode data are formed.

Of these, P for managing access, etc.
Channel and Q channel are used. However, the P channel only indicates a pause portion between tracks, and the finer control is performed on the Q channel (Q1 to Q1).
Q96). The 96-bit Q channel data is configured as shown in FIG.

First, the four bits Q1 to Q4 are used as control data, and are used for discrimination of the number of audio channels, emphasis, CD-ROM, and whether or not digital copying is possible. Next, 4 bits of Q5 to Q8 are set to ADR,
This indicates the mode of the sub-Q data.

In the case of a CD-R and a CD-RW, as shown in FIG.
A Memory Area) and a PCA (Power Calibration Area) are provided.

A lead-in area and a program area used for recording actual data following the lead-in area are a CD.
The data is recorded by a drive device corresponding to -R or CD-RW, and is used for reproducing recorded contents in the same manner as CD-DA and the like. PMA uses a recording signal mode for each track recording,
The start and end time information is temporarily recorded. After all the planned tracks are recorded, a TOC (Table of contents) is formed in the lead-in area based on this information. PCA is an area for trial writing in order to obtain an optimum value of laser power during recording.

3. Replacement management By the way, when a defective area on the disk 90 is inspected, for example, at the time of formatting or subsequent use of the disk 90, if a defective area is detected, necessary replacement processing is performed to replace the defective area with another area. Assignments have been made. The information on the defective area and the assignment destination is recorded as defect management information in, for example, a lead-in area or a lead-out area of the disk 90. For this reason, for example, in the lead-in area or the lead-out area, an area in which management information of a defective area is recorded is formed as a defect management area DMA. Note that, as a process for detecting a defective area, after data is recorded, for example, data recorded on the disk 90 stored in the buffer memory 20 is compared with data recorded on the disk 90.
Are compared, and if both data match as a result of the comparison, it is determined that the data was recorded normally in the area (for example, a sector) where the data was recorded, and both data match. If not, it is determined that some defect has occurred in the area where the data is recorded.

The DMA includes defect management information shown in FIG.
As shown in (a), the disc definition structure DDS, the primary defect list PDL,
A secondary defect list SDL is provided. The disc definition structure DDS manages a position where information for defect management is recorded, and records addresses such as a primary defect list PDL, a secondary defect list SDL, and a replacement area. That is, at the time of reproducing a disc, the actual information for defect management can be accessed by first reading the disc definition structure DDS.

As shown in FIG. 5B, in the primary defect list PDL, when a defective sector is found, the defective addresses dfaP1, dfaP2, and dfaP2 are set.
.. are recorded, and the number of sectors found as a defective address at the beginning is recorded as the number of PDL entries. The defect management mode based on the primary defect list PDL is a so-called slipping mode, and is generated, for example, at the time of formatting a disc. For defect management, as described above, a defect sector is first inspected over the entire recording surface at the time of manufacturing or formatting a disk. For each defective sector found at this time, its address is the defective address dfaP1, dfaP2, dfaP3,... In the primary defect list PDL.
Are sequentially recorded. However, in this case, the sector that replaces the found defective sector is set as the sector next to the defective sector. That is, the sector used for recording is shifted backward according to the defective sector, and this is called a slipping process.

An example of recording data based on a slipping process will be described with reference to FIG. In this figure, a part of the recording area is schematically shown in sector units. For example, FIG. 6A shows sectors Sec2 to Sec4 and sectors Sec6 to Se of the recording area.
An example is shown in which c10 is unrecorded and sector Sec5 is a defective sector. Therefore, the address of the sector Sec5 is managed as a defect address in the primary defect list PDL. When recording a file A formed of, for example, five sectors of data (data A1 to A5) shown in FIG. 6B in the recording area in such a state, the data write start position is set to sector Sec2. The data A1 is stored in the sector Sec2.
Data A2 is recorded in sector Sec3, and data A3 is recorded in sector Sec4. Further, since the sector Sec5 is determined to be a defective sector, the data A4 following the data A3 is recorded in the sector sec6 as indicated by the dashed arrow. Then, the data A5 is recorded in the sector Sec7 following the sector Sec6. After file A, FIG.
When recording a file B (B1 to B3) corresponding to, for example, three sectors shown in (d), sectors Sec7, Sec8, and Sec are used as shown in FIG.
9 recorded.

As an operation for reproducing the file A recorded by the recording operation based on the slipping process described with reference to FIG. 6, the data A4 is read and then a seek operation for jumping over the defective sector Sec5 is performed. Data A5 is read from Sec6.

The secondary defect list SDL shown in FIG. 5C is for managing defective sectors found when the user is using the defect list. The secondary defect list SDL includes defect addresses dfaS1 and dfaS when a defective sector is found.
Are recorded, and addresses rpa1, rpa2, rpa3,... As replacement sectors are recorded corresponding to these defective addresses. Then, the number of sectors found and registered as a defective address at the head is recorded as the number of SDL entries.

This secondary defect list SDL
Is a form called so-called linear replacement, and the list contents are updated (added) every time a defective sector is found during user use. In other words, for a defective sector found during user use, a sector in a required area is assigned as a replacement sector. Accordingly, as data in the secondary defect list SDL, several bytes (7 to 8 bytes) as the defect address dfa (x) for one found defective sector as described above,
14 to 16 bytes of several bytes (7 to 8 bytes) are used as the replacement address rpa (x).

An example in which data is recorded based on the linear replacement processing will be described with reference to FIG. In this figure, a part of the sector in the recording area,
And a part of the replacement sector. FIG. 7 shows a part of a replacement area in which a replacement sector is formed. The replacement area is provided separately from the normal recording area, and when a defective sector is detected in the normal recording area, it is an area where data is recorded instead of the defective sector. This makes it possible to compensate for the capacity of the recording area lost due to the defect.

In the example shown in FIG. 7A, similarly to the example shown in FIG. 6A, the sectors Sec2 to Sec4 and the sectors Sec6 to Sec10 are unrecorded and the sector Se is not recorded.
FIG. 7B shows a case in which file A (data A1 to A5) shown in FIG. 7B is recorded when c5 is a defective sector. Also in this case, the write start position is set to sector Sec2, data A1 is set to sector Sec2, data A2 is set to sector Sec3, and data A3 is set to sector Sec4.
Is recorded. Since the sector Sec5 is determined to be a defective sector, the data A4 following the data A3 is recorded in the replacement sector Rsec1 formed in the replacement area as indicated by the dashed arrow in the linear replacement process. Then, the data A5 is recorded in the sector Sec6 following the defective sector Sec5. File A
To record data (B1 to B3) corresponding to, for example, three sectors following (data A1 to A5), the sector S
Recorded in ec7, Sec8 and Sec9. As described above, in the example shown in FIG. 7, the data A4 to be originally recorded in the sector Sec5 is recorded in the replacement sector Rsec1. Then, the address of the sector Sec5 is the defect address d.
fa (x) and the address of the replacement sector Rsec1 are managed by the secondary defect list SDL as a replacement address rpa (x) corresponding to the sector Sec5. Although not shown, if there is a defective sector other than the defective sector Sec5, the replacement sector Rsec2,
Rsec3... Will be used.

When a defect is detected in the disk 90, a DMA (PDL, SDL) is formed in this way, and a defective sector and a replacement sector can be managed. By detecting the DMA from 90 as the identification information, it is possible to determine whether or not the replacement process is being performed.

The operation of reproducing data recorded by the recording operation based on the linear replacement process described with reference to FIG. 7 is, for example, as shown in the schematic diagram of FIG. In this figure, a wavy arrow indicates a seek operation involving movement of the optical pickup 1, and a solid arrow indicates a disc 90.
5 shows a read operation from the memory. For example, data A1
When reproducing the file A formed by A5, first, a seek operation for accessing the sector Sec2 in which the data A1 which is the head of the file A is recorded is performed (ac1). When the data A1 to A3 are read from the disk 90 (RD1), the data A1
4 to perform a seek operation to access the replacement sector Rsec1 (ac2). When the data A4 is read (RD2), a seek operation for accessing the sector Sec6 is performed to read the data A5 (ac3).
When the reading of data A5 (RD2) from 0 ends, the reading of file A ends.

As described above, the file A (data A1 to A1) recorded in the recording area and the replacement area in a distributed manner.
5) can be performed, but it is necessary to perform two seek operations (ac2, ac3) after the seek operation (ac1) for the data A1. Further, if the area where the data A1 to A3 and A5 are recorded and the replacement area where the data A4 are recorded are located on the disk 90 at distant positions, the time required for the seek operation becomes longer.

Therefore, in the present embodiment, data recorded in the spare area in advance is stored in the cache memory 30 in a so-called background, for example, when a process based on an instruction from the host computer 80 is not executed in the disk drive device. It can be stored. Therefore, when reading data recorded in the spare area, the cache memory 30
In this case, when actually reading data, the seek operation for the replacement area described with reference to FIG. 8 can be omitted.

4. Reproduction Process FIG. 9 is a flowchart illustrating an example of a process executed by the system controller 10 when the replacement data stored in the replacement sector is stored in the cache memory 30 in the background. When the disk 90 is loaded (S001), it is determined whether or not the loaded disk 90 has been subjected to the replacement process (S002). This determination is made, for example, by referring to the above-mentioned DMA. If it is determined that the disc has been subjected to the replacement process, a command from the host computer 80 (for example, recording, reproduction, etc.)
Is determined (S003). If it is determined that the process is being performed, the process waits. When it is determined that the replacement has not been performed, the replacement sector is accessed to reproduce the replacement data (S004), and the reproduced replacement data is stored in the cache memory 30 (S005). If it is determined in step S001 that the loaded disk 90 has not been subjected to the replacement process, the processing is not performed.

FIG. 10 is a schematic diagram for explaining the transition when reading data while accessing the replacement data stored in the cache memory 30. In this figure,
Along with a part of the recording area on the disk 90, a part of the recording area of the cache memory 30 in which replacement data is stored in the background of the disk drive device is shown. First, a seek operation is performed to access the sector Sec2 in which the data A1, which is the head of the file, is recorded (ac1). When the data A1 to A3 are read from the disk 90 (RD
1), skip the defective sector Sec5 and skip to the sector Sec6
Is performed (ac2), and at the same time, replacement data A4 is read out from the cache memory 30 (RM1). When the reading of the data A5 from the disk 90 (RD2) is completed, the reading of the file A is completed.

By storing the replacement data A4 in the cache memory 30 in this manner, the file A
In the case of performing the read operation, the seek operation can be reduced. As a result, it is possible to prevent the data transfer rate when the read data is stored in the buffer memory 20 from being lowered.

Next, according to FIG. 11, when there is a defective sector within a predetermined range from the sector (current position) corresponding to the optical pickup 1 in the background, the replacement data corresponding to the defective sector Is read from the replacement area and stored in the cache memory 30. In this embodiment, the predetermined range is, for example, 5
The description will be made as a range corresponding to the sector. FIG. 11 (a)
When the current position of the optical pickup 1 is, for example, at a position corresponding to the sector Sec2, the defective sector Sec5 is within a predetermined range, and the data A4 is transferred from the replacement sector corresponding to the defective sector Sec5. The data is read and stored in the cache memory 30. FIG.
As shown in (b), when the current position of the optical pickup 1 is, for example, a position corresponding to the sector Sec6, the defective sector Sec11 is not within the predetermined range, and therefore, in this state, the replacement data is not stored. Not done. Therefore, a state where only data A is stored in cache memory 30 is shown.

Then, as shown in FIG. 11C, the current position of the optical pickup 1 is, for example, the sector Se.
If the position corresponds to c7, the defective sector Sec1
Since 1 is within the predetermined range, the data B5 is read from the replacement sector corresponding to the defective sector Sec11 and stored in the cache memory 30. Therefore, a state where the data A4 and the data B5 are stored in the cache memory 30 is shown.

FIG. 12 shows an example of the processing steps executed by the system controller 10 when the replacement data stored in the replacement sector corresponding to the defective sector within a predetermined range is stored in the cache memory 30 in the background. It is a flowchart explaining. When the disk 90 is loaded (S101), it is determined whether or not the loaded disk 90 has been replaced (S10).
2) If it is determined that the replacement process has been completed, it is determined whether or not various processes (for example, recording, reproduction, etc.) are being executed based on an instruction from the host computer 80 (S103). If it is determined that various processes are being executed, the process waits for the end of the processes. Step S103
If it is determined that the command has not been executed, it is determined whether there is a defective sector within a predetermined range from the current position of the optical pickup 1 (S104). If it is determined that there is a defective sector within the predetermined range, a replacement sector corresponding to the defective sector within the predetermined range is accessed, and the replacement data is reproduced (S105). Store in the cache memory 30 (S1
06).

For example, in step S104,
When it is determined that there is no defective sector within the predetermined range, this corresponds to, for example, the state shown in FIG. 11B, and the replacement data is not stored at this time. Then, when the current position of the optical pickup 1 is changed by executing processing based on a command from the host computer 80 to be performed next time, the result of the determination in step S104 as to whether or not there is a defective sector within a predetermined range is determined. The replacement data is stored based on the replacement data.

As described above, replacement data corresponding to defective sectors within a predetermined range from the current position of the optical pickup 1 can be selectively stored in the cache memory 30. Therefore, for example, when performing prefetching, it is possible to select replacement data having a high probability of being requested and use the cache memory 30 efficiently. The look-ahead is
For example, in order to transfer data requested from an external device such as the host computer 80 as quickly as possible, the required data is assumed to be read from the disk 90 and secured in advance to improve the apparent access time. This is the process. Further, by selecting replacement data having a high required probability, the capacity of replacement data stored in the cache memory 30 can be reduced, and the recording area of the cache memory 30 can be used efficiently.

In the present embodiment, an example in which replacement data is stored in the cache memory 30 has been described. However, a dedicated memory for storing replacement data may be provided, or the buffer memory 20 may be used, for example. It is. That is, the configuration of the memory is not limited to this embodiment.

In this embodiment, the replacement data can be stored in the cache memory 30. However, the normal cache data and the replacement data are identified and stored, so that the cache memory 30 can be more efficiently stored. 30
Recording area can be used. FIG.
In the example shown in FIG. 2, the current position of the optical pickup 1 corresponds to the sector Sec4. In such a state, the area where the data A1 to the data A3 are stored as cache data is the read cache area 30a. Further, replacement data recorded in a replacement sector (not shown) corresponding to the defective sector Sec5 is stored in the replacement cache area 30b. Thus, in the course of performing the reproducing operation, for example, even when the read cache area 30a is overwritten, it is held in the replacement cache area 30b. That is, the operation of storing the replacement data in the replacement cache area 30b can be reduced.

[0059]

As described above, according to the present invention, when a replacement process is performed on a loaded disc, a process based on an instruction from an external device such as a host computer is executed. When not performed, replacement data recorded in a replacement area of the disk in advance can be stored in the memory. Therefore,
When reading the replacement data, the data can be read from the memory. Therefore, even when reading a file in which a part of the data is recorded in the replacement area of the disk, the seek operation for the replacement area is not performed. Can read the replacement data. Thereby, when reading the replacement data, the number of times of the seek operation to the disk can be reduced, so that a decrease in the data transfer rate can be suppressed.

Readout means (optical pickup)
When there is a defective area within a predetermined range from the current read position, the replacement data recorded in the replacement area corresponding to the defective area is stored in the memory. Therefore, replacement data having a high probability of being prefetched can be secured in advance.

Further, normal read data and replacement data are identified and stored in the memory.
Therefore, normal read data and replacement data can be individually handled in the memory. Thus, even when, for example, normal read data is overwritten in the memory, the replacement data can be secured, and the operation of storing the replacement data can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a disk drive device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a frame structure of the disk of the embodiment.

FIG. 3 is an explanatory diagram of a sub-coding frame of the disc according to the embodiment;

FIG. 4 is an explanatory diagram of a disk layout.

FIG. 5 is an explanatory diagram of a DMA structure of a disk.

FIG. 6 is a diagram illustrating a slipping process as a replacement process.

FIG. 7 is a diagram illustrating a linear replacement process as a replacement process.

FIG. 8 is a diagram illustrating an operation of reproducing data recorded by a recording operation based on a linear replacement process.

FIG. 9 is a flowchart illustrating an example of a process of storing replacement data stored in a replacement sector in a cache memory.

FIG. 10 is a schematic diagram illustrating a transition when reading data while accessing replacement data stored in a cache memory.

FIG. 11 is a diagram illustrating an example in which replacement data corresponding to a defective sector within a predetermined range from a sector corresponding to the optical pickup is stored in a cache memory.

FIG. 12 is a flowchart illustrating an example of a process of storing replacement data corresponding to a defective sector within a predetermined range in a cache memory.

FIG. 13 is a diagram illustrating an example of identifying and storing normal cache data and replacement data in a cache memory.

[Explanation of symbols]

1 pickup, 2 objective lens, 3 biaxial mechanism, 6
Spindle motor, 10 system controller, 1
2 encoding / decoding unit, 14 servo processor, 30 cache memory, 80 host computer, 90 disk

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04N 5/94 H04N 5/94 Z F-term (Reference) 5B065 CC06 EA15 5C052 AA02 AA04 AA17 AB04 AB08 AB09 BB03 CC08 DD04 DD06 5C053 FA23 FA27 HB10 KA05 KA24 5D044 BC02 CC04 DE38 DE49 DE60 DE62 DE64 GK12 5D077 AA23 CA02 CA20 DC08 EB01

Claims (4)

[Claims] 1. A processing means capable of executing various processes on a loaded disk based on an external command, and determining whether or not a replacement process is being performed on the disk from the disk. Detecting means for detecting identification information that can be identified; reading means for reading data recorded in a recording area of the disc or replacement data recorded in a replacement area by the replacement processing; A memory capable of storing the read data, and based on the identification information detected by the detection unit,
When it is determined that replacement processing is being performed on the disk and when processing by the processing means is not being performed, replacement data can be read from the replacement area and stored in the memory. A disk drive device comprising: storage control means. 2. An information processing apparatus comprising: an identification unit configured to identify a position of a defective area based on the identification information; and the storage control unit includes: 2. The disk drive device according to claim 1, wherein when there is a defective area, replacement data corresponding to the defective area is read and stored in the memory. 3. The memory according to claim 2, wherein the memory has an area for storing data read from the recording area and an area for storing replacement data read from the replacement area. 2. The disk drive device according to 1. 4. A step of detecting, from a loaded disc, identification information capable of discriminating whether or not replacement processing has been performed on the disc, and data recorded in a recording area of the disc. Or a step of reading replacement data recorded in a replacement area by the replacement process; a step of storing data read from the recording area based on an external command in a first area of a memory; and Storing the replacement data read from the replacement area in a second area of the memory when the processing based on the instruction is not performed.