JP2604489B2 - Optical disk processing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an optical disk processing device for recording and reproduction.

[Conventional technology]

Conventionally, in an optical disk processing apparatus, a large storage capacity of an optical disk medium and a bit error rate of 10 ^-4
~ 10 ^-5 , exchangeable media, the host system's operating system program issues a command to the disk unit, detects an erased block that has not been recorded at all, and reports abnormal termination. Therefore, when the disk storage medium is to be used for the first time, the host system issues a certify command to perform the entire erasing operation, the entire writing operation, the entire verify operation, and the system control track. A write operation is performed so that data is written to all blocks to be used so that an erase block is not detected even if a read command is issued to any block.

Hereinafter, the certify processing by the certify command in the conventional typical optical disk processing apparatus shown in FIG. 2 will be described. 2 includes a host interface controller 10 connected to a host system 15, a microprocessor 17, a ROM 18, a RAM 19, and a DMA.
4, 5, data buffers 6 and 7, a sector format controller 8, a drive interface controller 9 connected to the optical disk drive 16, a bus selector 11, an error correction circuit 12, and a modulation / demodulation circuit 13.

In the above configuration, first, in the write operation, when a write instruction is issued from the host system 15, the write instruction is issued to the host interface 102, the host interface control unit 1
It is input to the microprocessor 1 via 0. The microprocessor 1 controls the drive interface controller 9 via the bus 101, and instructs the optical disk drive 16 via the signal line 108 to move the optical head to the specified address. Next, the microprocessor 1 instructs the bus selector 11 to receive the write data.
The write data is stored in the data buffer 6 by the DMA 4 via the host interface control unit 10 and the bus selector unit 11. Next, the write data in the data buffer 6 is encoded by the error correction circuit 12, added with an error correction code, and transferred to the modulation / demodulation circuit 13. Further, this data is sent to the optical disk drive 16 via the data transfer path 106 of the drive interface in accordance with the write format given by the sector format controller 8. Further, after the execution of the write operation, the data buffer 6
Verify check operation with data stored in
That is, a reading confirmation operation is performed. If there is an error in the read data at the time of this verify operation, a replacement block process is performed. The replacement block process is a process of rewriting data in a spare block prepared in advance to replace a defective block. During the verify operation, the microprocessor 1 controls the host interface controller 10, the bus selector 11, and the DMA 5 from the host system 15 to store the next write data in the data buffer 7 for the next write processing. .

Next, in the read operation, when a read command is received from the host system 15, the optical disk drive 16 is instructed to move the optical head in the same manner as the write operation. The read data is demodulated by the modulation / demodulation circuit 13 via the data transfer path 106 of the drive interface, and the sector format control unit 8 discriminates the data portion from the address portion. The sector format control section 8 generates timings such as a write position and a read position, and sends them to the modulation / demodulation circuit 13 and the error correction circuit 12. The read data is sent to the error correction circuit 12, where the error occurrence position and the error pattern are calculated using the error correction code, and if there is an error, the error is corrected. The error correction level of the error correction circuit 12 at the time of the read command is higher than that at the time of the verify operation. The data after the error correction is once stored in the data buffer 6. In the read operation, if there is no error in the read data, the read data is transferred to the host system 15 via the bus selector 11 and the host interface controller 10. If the block has been subjected to the replacement block processing at the time of reading, the optical head is moved to the replacement block area to search for the corresponding block, and the data of the corresponding sector is transferred to the host system 15.

FIG. 3 is a flowchart of the certify process. Next, referring to FIG. 3, in the certify process, the optical head is first moved to the first block, and the entire recording area is erased (step,). After completing all the writing processes, the optical head is moved to the first block, and the reading conditions for the verify (read confirmation) operation are set (S,). A verify operation of the user area is performed (step), and it is checked whether there is an error (defect) (step). If an error is detected, writing to the replacement block is performed, and a verify operation is performed (steps 1 and 2). Here again, if an error is detected, re-replacement processing is executed (step,). If there is no error before the number of re-replacements exceeds a specified number, replacement block information is created (step), and processing of unprocessed blocks is performed. Continue (step). If the retry of the replacement process exceeds the specified number, the error status is edited and an abnormality report is made (step). When all the processes have been completed, the system control information and the replacement process information are written on the optical disk medium (step,), and all the operations of the certification process are completed.

FIG. 4 is a flowchart when an erase block is detected during the reading process. Referring to FIG. 4, first, the optical head is moved from the host system 15 to the designated block, and the designated block is read. (Step,). At this time, the record of the replacement information is searched to check whether there is a corresponding block (step). If there is a corresponding replacement block, the replacement block is read, and if there is no replacement block, the designated block is read, and it is checked whether or not the erase block is included in any case (step,,). If there is an erase block in the read block, an error status of erase block detection is set, and an abnormal end report is made to the host system (steps, and). Next, it is checked whether there is an error in the read block (step). If there is an error, perform a retry read of the block. If there is no error or the retry reading succeeds, the read data is transferred to the host system (step ,,). If the retry reading is unsuccessful, set the error status (step,), transfer the data up to the block before the error (step),
Go to step and report abnormal termination to the host system.

[Problems to be solved by the invention]

In the above-described conventional optical disk processing apparatus, it takes a long time to access the entire surface of the disk medium for certification processing three times, and the operating system of the host system abnormally terminates by detecting an erase block from the optical disk processing apparatus. Is reported,
There is a disadvantage that the subsequent processing is temporarily interrupted.

[Means for solving the problem]

An optical disk processing device according to the present invention is provided between a host system and an optical disk drive device. The optical disk processing device performs sector format control at the time of writing and reading data and performs error correction by interleaving data. Simple format processing means for erasing the entire surface and writing system control information to the system control track; erasure block detection means connected in parallel to a data transfer path with the optical disk drive to detect erasure blocks during reading; And padding means for padding fixed data to the erase block detected by the erase block detecting means and sending it to the host system.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. In the embodiment of FIG. 1, blocks having the same reference numerals as those in FIG. 2 indicate the same blocks as those in FIG. In addition to each block of the conventional optical disk processing apparatus shown in the figure, a modulation / demodulation circuit
Data transfer path 10 between 13 and optical disk drive 15
An erase block detection circuit 14 is connected to 6, and the erase block detection circuit 14 is also connected to the bus 101 and the sector format control unit 8. Also microprocessor
1, ROM2 and RAM3 also have functions for the present invention, but are essentially each of the microprocessor 1 shown in FIG.
7, Same as ROM18 and RAM19.

Next, a description will be given of a simplified format process according to the present invention, which replaces the conventional certify process. FIG. 5 is a flowchart of the simple format process. In this process, first, the optical head is moved to the first block, and the entire recording area is erased (steps and steps).
). If no error (abnormal state) is detected during erasing, write system control information and no replacement processing information to the system control track (step,
If an error is detected during erasure, an error status is reported to the host system 15 (step), and the process ends.

Next, the reading process performed in the present invention will be described. FIG. 6 is a flow chart of the reading process in the present invention. In this flow, the detection of the erased block in the step in the conventional reading process of FIG. 4 is detected by the erased block detecting circuit 14, and instead of the step in FIG. Is that the step is executed. That is, the optical head is moved to the block specified by the host system 15, and the reading of the specified block is executed. Next, replacement information is searched to check whether a corresponding block exists. If there is a corresponding replacement block, the replacement block is read (steps 1 to 4). The above is the same as FIG. 4, but if the erase block is included in the read block,
Without setting the error status of erase block detection,
As data to be sent to the host system, for example, "00 ..."
00 "is padded to the data buffer 6 or 7 (step). Next, it is checked whether there is an error in the read block. If there is an error, the block is retried and read (step,). If the retry read succeeds, the read data is transferred to the host system (step), and the padding data for the erased block is also transferred to the host system together with the retry read. If an error occurs, an error status is set, data is transferred up to the block before the error, and an abnormal end is reported to the host system (Steps 1 and 2).
). As a result, the reading process is continued without abnormally ending the erase block.

〔The invention's effect〕

As described above, according to the present invention, simple formatting processing and padding data are sent out when an erased block is detected to perform a readout processing that does not indicate an abnormal end, in the case where an abnormal end is detected in the erase block detection in the conventional certifying processing and reading processing. Thus, of the entire erasing operation, the entire writing operation, the entire verify operation, and the writing operation of the system control track performed in the certification processing, in the simplified format processing of the present invention, only the entire erasing operation and the writing operation of the system control track are performed. The entire writing operation and the entire verifying operation can be omitted, and the format processing time can be shortened. In addition, by performing a reading process for transferring fixed data when an erase block is detected, even if an erase block exists, the reading process can be executed continuously without abnormal termination.
This has the effect of speeding up the reading process.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a conventional typical optical disk processing apparatus, FIG. 3 is a flowchart of a certification process in FIG. 2, and FIG. 4 is a reading operation in FIG. 5, FIG. 5 is a flowchart of the simple format process in the present invention, and FIG. 6 is a flowchart of the reading operation of FIG. 1,17 …… Microprocessor, 2,18 …… ROM, 3,19 …… R
AM, 4,5 ... DMA, 6,7 ... Data buffer, 8 ... Sector format control unit, 9 ... Drive interface unit, 10 ... Host interface control unit, 11 ... Bus selector unit, 12 ... Error correction circuit, 13… Modulation / demodulation circuit,
14 …… Erase block detection circuit, 15 …… Host system,
16 Optical disk drive.

Claims (1)

(57) [Claims] 1. An optical disk processing apparatus, which is provided between a host system and an optical disk drive apparatus and performs an error correction by interleaving data in a sector format at the time of writing and reading data, and completely erasing the disk storage medium at initialization. Simple format processing means for writing system control information to a system control track; erase block detection means connected in parallel to a data transfer path with an optical disk drive to detect an erase block when reading; A padding means for padding fixed data to an erase block detected by the means and sending the fixed data to a host system.