JPH0380469A - Optical disk control device - Google Patents

Abstract

PURPOSE:To improve the ability of error recovery by forming a means for storing data to be written in a sector, and when an error is detected in data read out from a substitutive sector, reading out data from the storage means. CONSTITUTION:The same data as that to be written in an optical disk device 3 are written in an optical disk device 4 and the data of the sector from which an error is detected at the time of writing the data in the device 3 are written in a substitutive writing data buffer 15. If an error is detected in the data read out from the substitutive sector, sector data 105 are read out from the buffer 15, and when an error is detected in the sector, data are read out from the sector of the device 4 corresponding to the sector concerned. Even if data read ing from the medium of the device 3 is disabled, data stored in the buffer 15 and the device 4 can be substituted for the data, so that the error recovery ability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an optical disc control device, and more particularly to error recovery processing for an optical disc control device.

BACKGROUND OF THE INVENTION Conventionally, optical disk control devices have read and written data to original sectors or alternative sectors within a single optical disk medium.

In such conventional optical disk control devices, data is read and written to a single optical disk medium, so if a read error that occurs in the optical disk medium is not recovered, the process ends abnormally. There is a drawback.

OBJECTS OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks of the conventional devices, and an object of the present invention is to provide an optical disk control device that can improve error recovery capability.

Composition of the Invention An optical disc control device according to the present invention is an optical disc control device that performs alternative sector processing for a sector in which an error is detected when writing data to an optical disc device, and wherein an error is detected when writing data to the sector. storage means for storing data to be written to the sector when the
The present invention is characterized by further comprising a control means for controlling the reading of data from the storage means when an error is detected in the data read from the alternative sector of the optical disc device.

Another optical disk control device according to the present invention is an optical disk control device that performs alternative sector processing for a sector in which an error is detected when writing data to a first optical disk device, a second optical disk device in which the same data as the data to be written is written;
Ma111 means for controlling the reading of data from the sector of the second optical disc device corresponding to the sector when reading data from the sector of the first optical disc device becomes impossible; Features.

Another optical disk control device according to the present invention is an optical disk control device that performs alternative sector processing for a sector in which an error is detected when writing data to a first optical disk device, a second optical disk device in which the same data as the data to be written is written;
When an error is detected when writing data to the sector, a storage means for storing data to be written to the sector, and an indication of whether a write error is detected in the sector corresponding to the position information of the sector. a holding means for holding error information; and when an error is detected in data read from a sector of the first optical disk device, the error information of the holding means indicates that a write error has been detected in the sector; when the error information in the holding means indicates that no write error has been detected in the sector, and the error has not been recovered by error sector processing for the sector; and control means for controlling data to be read from the sector of the second optical disk device corresponding to the sector when the sector is read out.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, an optical disc control device 1 processes data between a host device 2 and an optical disc device 3.4.

When the write data transfer circuit 11 of the optical disk control device 1 receives the write data +00 from the host device 2, it transfers the write data 101 to the write data buffer 12.

The write data buffer 12 is the write data transfer time 72!
It stores write data 101 from 11 and sends write data 102 to encoding circuit 13 and alternative write data buffer 15.

The encoding circuit 13 uses the write data 102 from the write data buffer 12 to generate error correction/detection bytes (hereinafter E).
CC byte) and write data buffer 1
The write data 102 from 2 and the generated ECC byte are sent to the modulation circuit 14 as data 1 (13).

Modulation circuit] 4 modulates the data 103 from the encoding circuit 13 into a signal required by the optical disk devices 3 and 4, and sends the modulated signal as data 104 to the optical disk devices 3 and 4.

The alternative write data buffer 15 stores the write data of the write error sector among the write data 102 from the write data buffer 12, and sends the write data as sector data 105 to the encoding circuit 13 and read redata buffers 19 and 20. .

The demodulation circuit 16 demodulates the read data 108 and 107 from the optical disk devices 3 and 4 into the signal required by the upper α device 2, and uses the demodulated signal as read data 108 to the ID reading circuit 17 and error correction/detection circuit (hereinafter referred to as (ECC circuit) 18.

The ID reading circuit 17 reads ID (1 dentiHer) from the read data 108 from the demodulation circuit 16,
When the reading is completed, an ID reading completion signal 109 is output to the internal bus 200.

The ECC circuit 18 receives the read data 10 from the demodulation circuit 16.
Error correction and error detection are performed on 8, and the error-corrected read data 110 and 111 are sent to data buffers 19 and 20 for reading, respectively.

Further, when an error is detected in the read data 108 from the demodulation circuit 16, the error report signal 112 is sent to the internal bus 20.
0 to the microprocessor 26.

The read redata buffer 19 contains the read data 10B from the previous disk device 3, the read data 110 whose error has been corrected and detected by the ECC circuit 18, the sector data 105 from the alternative write data buffer 15, and the read redata buffer 2o. The sector data 114 from 1 and 2 are stored therein, and these data are sent to the read data transfer circuit 22 as read data 113.

The read data buffer 20 stores the read data 107 from the optical disk device 4, the read data l(l) whose error has been corrected and detected by the ECC circuit 18, and the sector data 105 from the alternative write data buffer 15. Sector data 114 in place of the error sector data that could not be read in device 3
is sent to one read redata buffer.

Buffer control circuit 21 is configured to send a control signal +15 to write data buffer 12, alternative write data buffer 15, and read redata buffer 19, 20, respectively, to control each circuit.

The read data transfer circuit 22 is a read redata buffer 19
The read data 113 is transferred to the host device 2 as read data 11B.

The device interface circuit 23 sends and receives signals to and from the optical disk device 3.4 via the signal line 117, and communicates with the buffer control circuit 21, RAM (random access memory) 24-25, and microprocessor 26 via the internal bus 200. , and a host interface circuit 27, respectively.

The RAM 24 stores ID information and error sector tables (write error sector table and read error sector table) in the optical disk device W3, and
25 stores ID information and error sector tables (@-included error sector table and read error sector table) in the optical disc device 4.

Microprocessor 26 via internal bus 200
The read circuit 17 receives the track number and sector number of the ID section of the read data, and controls the buffer control circuit 21.

The host interface circuit 27 sends and receives signals to and from the host device 2 via the signal line 11g, and to the buffer control circuit 21, RAM 24.25, microprocessor 26, and device interface circuit 23 via the internal bus 200. It is connected.

FIG. 2 is a diagram showing a sector format in the optical disc devices 3 and 4 of FIG. 1. In the figure, a sector consists of an ID section 5, a gap 6, and a data section 7, and the ID section 5 is PLL (phase 1ocked 1oo9).
) synchronization byte 51, ID synchronization byte 52, track number 53, sector number 54, error detection (CRC;
cyclic redundancy check
) bytes 55.

The data section 7 also includes a PLL domei byte 71, a data synchronization byte 72, a track number 73, and a sector number 74.
, data 75, and error correction/detection byte (hereinafter EC
C bytes) 76.

Here, in the original sector where data should originally be written, track number 73 of data section 7 and sector number 7
4, track number 53 and sector number 5 of ID section 5
The same content as 4 is written, and in the substitute sector, the track number 73 and sector number 74 of the data section 7 are written with the track number 53 and sector number 54 of the ID section 5 of the original sector targeted for substitution processing. The same content is written.

The operation of a seventh embodiment of the present invention will be explained using FIGS. 1 and 2.

Microprocessor 26 is host interface circuit 2
When receiving a write command from the host device 2 via 7 and internal bus 200, it instructs buffer control circuit 21 to perform a write operation via internal bus 200.

When the buffer control circuit 21 receives a write instruction from the microprocessor 26, it puts the write data buffer 12 into the write state by the control signal 115, so that the host device 2
The write data 100 from the write data transfer circuit 11
The data is written to the write data buffer 12 via the write data buffer 12.

When all of the write data 100 from the host device 2 is written into the write data buffer 12, the buffer control circuit 21 reports completion to the microprocessor 26 via the internal bus 200.

Upon receiving the completion report from the buffer control circuit 21, the microprocessor 26 controls the device interface circuit 23.
A write command is issued to the optical disk device 3 via the write data buffer 1 to the buffer control circuit 21.
2, the write data 100 from the host device 2 is instructed to be transferred to the optical disk device 3.

When the buffer control circuit 21 receives a transfer instruction from the microprocessor 26, it puts the write data buffer 12 into the read state by the control signal 115, so that the write data 102 read from the write data buffer 12 is sent to the encoding circuit 13 and the modulation circuit. The data is transferred to the optical disc device 3 via 14.

When all the write data 102 from the write data buffer 12 is transferred to the optical disk device 3, the microprocessor 26 transfers the device interface circuit 23 to the optical disk device 3 in order to determine whether the data written in the optical disk device 3 is good or bad.
A read command is issued to the optical disc device 3 via the optical disc device 3.

When the optical disk device 3 receives a read command from the microprocessor 26, it reads ID information and read data 10B from an optical disk medium (not shown) sector by sector and transfers it to the demodulation circuit 16.

The ID information and read data 10B transferred from the optical disk device 3 are demodulated by the demodulation circuit 16 into signals required by the host device 2, and the ID information is first transferred to the ID reading circuit 1.
Sent on 7th.

When the ID reading circuit 17 reads the ID information from the read data 10g from the demodulation circuit 16, it sends an ID reading completion signal (0) to the macroprocessor 26 via the internal bus 200.
Outputs 9.

The microprocessor 26 receives the I from the ID reading circuit 17.
When the D read completion signal 109 is input manually, the track number 53 and sector number 54 are received from the ID reading circuit 17, and these track number 53 and sector number 54 are written into the RAM 24.

On the other hand, when the FCC circuit 18 receives the read data 10g from the demodulation circuit 16, it checks the read data 108 at sector II, and if an error is detected in the read data 108, it sends the data to the microprocessor via the internal bus 200. The error report signal 112 is output to 26.

When the microprocessor 26 receives the error report signal 112 from the ECC circuit 18, it performs alternative sector processing for the sector in which an error has been detected.

At the same time, the ID section 5 of the original sector targeted for the alternative sector processing is read from the ID reading circuit 17,
Based on the ID section 5, the write error sector table of the RAM 24 is filled with the ! of the sector stored in the RAM 24. The sector number 53 and sector number 54 are written, and the corresponding write error flag is turned on.

When the acceptability of all the data written in the optical disk device 3 is determined, the microprocessor sensor 26 refers to the write error sector table in the RAM 24 and writes the write data corresponding to the sector for which the write error flag is turned on. The buffer control circuit 21 is instructed to transfer the write data 102 from the buffer 12 to the alternative write data buffer 15.

The buffer control circuit 21 controls the write data buffer 12 and the alternative write data buffer 15, and causes the write data 102 corresponding to the sector whose write error flag is turned on to be transferred from the write data buffer 12 to the alternative write data buffer 15.

The microprocessor 26 temporarily terminates the write command from the host device 2 if no error is detected in the data written to the optical disk device 3 or if all the write data 102 corresponding to the error sector is transferred to the alternative write data buffer 15. do.

When the microprocessor 26 is reissued from the host device 2 and receives a write command that is the same as the above command, the same data as the write data 100 written to the optical disc device 3 is transferred to the optical disc device 4 in the same manner as the above processing operation. control to write to.

In addition, in the same manner as the above processing operation, the microprocessor 26 determines whether the data written in the optical disk device 4 is good or bad, and as a result, the ID information of the data 107 read from the optical disk device 4 is stored in the RAM 25. and an error sector table are stored.

Note that even when the write data 100 from the host device 2 is written to the optical disk device 4, if an error is detected in the data written to a sector of the optical disk device 4, alternative sector processing is performed for the sector. At the same time, the write data 102 from the write data buffer 12 corresponding to the original sector targeted for the substitute sector processing is transferred to the substitute write data buffer 15.

As described above, the write data 10 from the upper α device 2
0 is stored in the optical disk devices 3 and 4, when a read command from the host device 2 is input to the microprocessor 26 via the host interface circuit 27, the microprocessor 26 reads the optical disk device via the device interface circuit 23. 3, issue a read command.

When the optical disk device 3 receives a read command from the microprocessor 26, it reads the ID from the optical disk medium in sector units.
The demodulation circuit 1-6 successively outputs information and read data 106.
Transfer to.

The ID information and read data 106 transferred from the optical disk device @3 are demodulated by the demodulation circuit 16 into signals required by the host device 2, and the ID information is first transferred to the ID reading circuit 1.
Sent on 7th.

When the ID reading circuit 17 reads the ID information from the read data 108 from the demodulation circuit 16, it sends an ID reading completion signal 109 to the microprocessor 26 via the internal bus 200.
Output.

The microprocessor 26 receives the I from the ID reading circuit 17.
When the D read completion signal 109 is input manually, the track number 53 and sector number 54 are received from the ID reading circuit 17, and these track number 53 and sector number 54 are written into the RAM 24.

On the other hand, read data 108 from demodulation circuit 16 is sent sector by sector to ECC circuit 18, and after error correction is performed by ECC circuit 18, it is written to read redata buffer 19.

At this time, the read data 108 that has not been error-corrected by the ECC circuit 18 is reported to the microprocessor 26, so the microprocessor 26 receives the ID part 5 of that sector from the ID reading circuit 17, and based on the ID part 5. R is written in the read error sector table of RAM24.
The track number 53 and sector number 54 of the sector stored in the AM 24 are written, and the corresponding read error flag is turned on.

When all the read data 106 from the optical disk device 3 is transferred to the read redata buffer 19, the microprocessor 26 refers to the read error sector table in the RAM 24.

If the read error flag of this read error sector table is on, the microprocessor 26
refers to the write error sector table in RAM 24, and if the write error flag is on, the RAM
The track numbers and sector numbers written in each of the 24 write error sector tables and read error sector tables are compared.

As a result, if there is a match, the microprocessor 26 reads the sector data 105 corresponding to that sector from the alternative write data buffer 15 and redata buffer 1.
The buffer control circuit 21 is instructed to transfer the data to 9.

In other words, when the write error flag is on, data is read from the alternative sector, but when the read error flag is also on, it indicates that an error was detected in the data read from the alternative sector. At that time, data will be read from the alternative write data buffer 15.

The buffer control circuit 21 puts one read redata buffer into a write state, reads sector data 105 corresponding to the corresponding sector from the alternative write data buffer 15,
Read redata buffer Write to the sector where a read error occurred.

If the read error flag in the read error sector table is on, the microprocessor 26
Referring to the write error sector table M24, if the write error flag is off, error sector processing is performed using an alternative sector of the optical disk medium of the optical disk device 3.

If the error state is not recovered by this error sector processing, the microprocessor 26 issues a read command to the optical disc device 4 via the device interface circuit 23.

In other words, when the write error flag is off, the data of the sector is not stored in the alternative sector and the alternative write data buffer 15, so if the error state is not recovered by the error sector processing, the optical disk device 3 It becomes impossible to read data from this sector, and data must be read from the sector corresponding to this sector of the optical disc device 4.

When the optical disk device 4 receives a read command from the microprocessor 26, it reads the ID from the optical disk medium in sector units.
The information and read data 106 are read and transferred to the demodulation circuit 16.

The ID information and read data 10B transferred from the optical disk device 4 are demodulated by the demodulation circuit 16 into signals required by the host device 2. First, the ID information is sent to the ID reading circuit 1.
Sent on 7th.

When the ID reading circuit 17 reads the ID information from the read data 108 from the demodulation circuit 16, it sends an ID read completion signal IQ to the microprocessor 26 via the internal bus 200.
Outputs 9.

The microprocessor 26 receives the I from the ID reading circuit 17.
When the D read completion signal 109 is inputted manually, the track number 53 and sector number 54 are received from the ID reading circuit 17, and these track number 53 and sector number 54 are written into the RAM 25.

On the other hand, read data 108 from demodulation circuit 16 is sent sector by sector to ECC circuit 18, and after error correction is performed by ECC circuit 18, it is written to read redata buffer 20.

At this time, the read data t08 whose error was not corrected by the ECC circuit 18 is reported to the microprocessor 26, so the microprocessor 26 receives the ID section 5 of that sector from the ID reading circuit 17 and based on the ID section 5. In the read error sector table of RAM25, R
The track number 53 and sector number 54 of the sector stored in the AM 25 are written, and the corresponding read error flag is turned on.

Next, the microprocessor 26 compares the read error flags of each of the RAMs 24 and 25, and if the read error flag of the RAM 24 is on and the read error flag of the RAM 25 is off, the data of the track number 53 and sector number 54 is read. The buffer control circuit 2 controls the transfer from the redata buffer 20 to one read redata buffer.
1.

The buffer control circuit 21 puts one read redata buffer into a write state, reads sector data 114 corresponding to the corresponding sector from the read redata buffer 20, and writes it to the read data buffer 19 at the sector where the read error occurred. It's crowded.

The read error flag of RAM24 is on, and the read error flag of RAM25
If the read error flag is on, the microprocessor 26 refers to the write error sector table in the RAM 25, and if the write error flag is on, the microprocessor 26 reads the track number 53 and sector number 54.
The buffer control circuit 2 transfers the data from the alternative write data buffer 15 to the read data buffer 19.
1.

The buffer control circuit 21 puts one read redata buffer into a write state, reads sector data 105 corresponding to the corresponding sector from the alternative write data buffer 15,
Read redata buffer Write to the sector where a read error occurred.

Further, the microprocessor 26 refers to the write error sector table in the RAM 25, and if the write error flag is off, processes the error sector using a substitute sector of the optical disk medium of the optical disk device 4.

The microprocessor 26 checks whether there are any errors in the read data 106 from the optical disk device 3 and replaces the data in the error sector with write data, but after performing normal error sector processing, it instructs the buffer control circuit 21 to read the data. When the read data 1z3 from one redata buffer is transferred to the host device 2 via the read data transfer circuit 22 and all the read data 106 from the optical disk device 3 is transferred, the read command from the host device 2 is terminated.

In this way, the same data as the data written to the optical disk device 3 is written in the optical disk device 4, and the data of the sector in which an error was detected when writing data to the optical disk device 3 is written to the alternative write data buffer 15.
If an error is detected in the data read from a sector of the optical disk device 3, if an error is detected when writing data to that sector, that is, if an error is detected in the data read from the alternative sector. is detected, sector data 1 is transferred from the alternative write data buffer 15.
05, and if no error is detected when writing data to that sector, and the error state is not recovered by error sector processing for that sector, the data is read from the sector of the optical disk device 4 corresponding to that sector. By controlling the data so that it continues to flow, even if it becomes impossible to read data from the optical disk medium of the optical disk device 3, it can be replaced with data stored in the alternative write data buffer 15 and the optical disk device 4. Therefore, it is possible to improve the error recovery ability in reading data from the optical disk device 3, especially for errors that occur.

Incidentally, in one embodiment of the present invention, when it becomes impossible to read data from the optical disk medium of the optical disk device 3,
Alternative write data buffer 15 and optical disk device 4
However, it is clear that either the alternative write data buffer 15 or the optical disk device 4 can improve the error recovery capability compared to the conventional one, so the present invention is limited to this. Not done.

As described in detail, according to the optical disc control device of the present invention, when an error is detected during data writing to the optical disc device, the data to be written to the sector is stored in the storage means, and the optical disc device When an error is detected in the data read from the alternative sector of the optical disk device, by controlling the data to be read from the storage means, data that cannot be read from the optical disk device can be replaced with data from the storage means. This has the effect of improving error recovery capability.

Further, according to another optical disc control device of the present invention, the second
When the same data as the data to be written to the first optical disk device is written to the optical disk device of the second optical disk device, and it becomes impossible to read data from the sector of the first optical disk device, the second optical disk device corresponding to this sector is written. By controlling the reading of data from sectors of the optical disk device, data that cannot be read from the first optical disk device can be replaced with data from the second optical disk device, This has the effect of improving error recovery ability.

Furthermore, according to another optical disc control device of the present invention, when an error is detected when writing data to the first optical disc device, the data to be written to the sector is stored in the storage means, and the data is written to the second optical disc device. If the same data as that to be written to the first optical disk device is written to the first optical disk device, and an error is detected in the data read from the sector of the first optical disk device, a write error is detected in the sector. a second optical disk device corresponding to the sector when no write error is detected in the sector and the error is not recovered by error sector processing for the sector; By controlling data to be read from the sector, data that cannot be read from the first optical disk device can be replaced with data from the storage means and the second optical disk device, improving error recovery capability. It has the effect of being able to improve the

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a groove bottom of an embodiment of the present invention, and FIG. 2 is a diagram showing a sector format in the optical disc device of FIG. 1. Explanation of symbols of main parts 1... Optical disk control device 2... Host device 3.4... Optical disk device 15... Alternative write data buffer 18...・
...Error correction/exposure circuit 19.20...Read redata buffer 21...Buffer control circuit 24.25...RAM 26...Micro processor

Claims (3)

[Claims] (1) An optical disk control device that performs alternative sector processing for a sector in which an error is detected when writing data to the optical disk device, which writes to the sector when an error is detected while writing data to the sector. and a control means for controlling the data to be read from the storage means when an error is detected in the data read from the alternative sector of the optical disc device. Optical disk control device. (2) An optical disk control device that performs alternative sector processing for a sector in which an error is detected during data writing to a first optical disk device, wherein the same data as the data written to the first optical disk device is When it becomes impossible to read data from a sector of the first optical disk device and a second optical disk device to which data is written, control is performed to read data from a sector of the second optical disk device that corresponds to the sector. 1. An optical disc control device comprising a control means. (3) An optical disk control device that performs alternative sector processing for a sector in which an error is detected when writing data to a first optical disk device, wherein the same data as the data written to the first optical disk device is a second optical disk device to which data is written; a storage means for storing data to be written to the sector when an error is detected when writing data to the sector; holding means for holding error information indicating whether or not a write error has been detected; and when an error is detected in data read from a sector of the first optical disk device, the error information of the holding means is stored in the sector; control to read data from the storage means when a write error is detected in the sector; and when the error information in the holding means indicates that no write error has been detected in the sector; An optical disc control device comprising: control means for controlling reading data from a sector of the second optical disc device corresponding to the sector when the error is not recovered by error sector processing.