JPH0578105B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a data recording system, and particularly to a recording system for recording data on a recording medium such as a magnetic disk or a rewritable optical disk.

[Background of the invention]

Traditionally, optical disks were not rewritable, so
It is not possible to erase the recorded data and write new data, so there is no possibility of forgetting to erase or erroneously erasing data in the replacement area. However, in recent years, with the development of rewritable optical disks, it has come to be expected that data will be destroyed due to forgetting to erase data in a replacement area or erasing data incorrectly. Conventional data recording methods include Japanese Patent Application Laid-Open No. 58-77034 (Japanese Patent Application No. 173860-1982).
As described in item 1), there was a method that wrote the original block number in the data section of the replacement area, but no consideration was given to the case where the original block number written in the replacement area could not be read due to a data error. Ta.

[Purpose of the invention]

An object of the present invention is to provide a data recording system that accurately uses the data in the replacement area as original block data when reading, and prevents forgetting to erase or erroneously erasing data in the original block in the replacement area when erasing the original block. Our goal is to provide the following.

[Summary of the invention]

In order to achieve the above object, the data recording system according to the present invention is characterized in that a plurality of original block numbers are written in the data written in the replacement block and replacement area.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows an explanatory diagram of separated areas on an optical disk medium to which the present invention is applied. As shown in FIG. 3, in the optical disc medium, the original area 1 is from track number A to track number B, and the alternate area 2 is from track number B+1 to track number C. FIG. 4 shows the format of one track in the original area 1 and replacement area 2, where one track 5 consists of n original blocks 3-1 to 3-3.
-n and one alternating block 4. When an error occurs in one block during reading after writing in the original area 1, the replacement block 4 takes over the block (ie, writes the correct data of the block with the error to the replacement block). Also, if two or more blocks of errors occur during reading after writing to original area 1,
One block among them is replaced by replacement block 4 in the track where the error occurred, and the remaining data are written into replacement area 2 in this way.

Figure 5 is a diagram showing the data structure of one block.
On the optical disk medium, the codeword "10" of section "1" is written in the following order: codeword "1" of section "1", codeword "2" of section "1", codeword "3" of section "1". After the byte data is written sequentially up to ”,
Next, byte data is sequentially written in the order of code word "1" of section "2", code word "2" of section "2", etc. up to code word "10" of section "2", and the following: Similarly, byte data is written in order from the section with the smallest value and from the smallest codeword value up to codeword "10" of section "16". Here, information data is written in sections “1” to “12”.
An error correction code (ECC) is written in sections "13" to "16". In the case of replacement block 4 and replacement area 2 blocks, the original block number is also written.

The present invention is characterized in that a plurality of original block numbers are written in the replacement block and the blocks in the replacement area, and FIG. 1 shows the block configuration of a first embodiment according to the method of the present invention. In the figure, 7a and 7b are original block numbers each consisting of 3 bytes, and the original block number 7a written in codewords "5" to "7" of section "12" and the codeword of section "12" The original block number 7b written from “8” to “10” has the same value, respectively.
, two are written. That is, in this embodiment, two original block numbers are written consecutively in the same section.

FIG. 2 shows a block configuration of a second embodiment according to the present invention. In the figure, 8a and 8b are original block numbers each consisting of 3 bytes, and the original block number 8a written in codewords "1" to "3" of section "1" and the codeword of section "12" The original block numbers 8b written from "8" to "10" have the same values. That is, in this embodiment, two original block numbers are written in separate sections such as sections "1" and "12".

Next, a reading circuit for an optical disk medium will be explained. FIG. 6 shows a block system diagram of an example of this reading circuit. A read signal read from an optical disk medium enters from an input terminal 10, passes through a read amplifier 11 and a variable frequency oscillator (VFO) 12, and is supplied to a demodulation circuit 13, where it is demodulated and then sent to a block memory 14. written to. The ECC circuit 15 is supplied with the output signal of the demodulation circuit 13, and determines whether there is an error correction area and whether the error correction is possible.If there is an error area and it can be corrected, the ECC circuit 15 performs calculation using the above-mentioned ECC. By performing error correction, the error data in the block memory 14 is corrected and restored to correct data.
Data memory 16 stores data read from block memory 14. The operation of the microprocessor 17 is controlled by a control signal from the memory 18, and if there is data of an alternate block among the data stored in the data memory 16, a predetermined block is stored in the data memory 16. The data of the original block is replaced with the data of the replacement block. The interface circuit 19 transfers correct data read from the data memory 16 to a host device (not shown) via an output terminal 20.

Next, a method for determining the original block number of an optical disk medium on which a plurality of original block numbers have been written using the method of the present invention will be explained. When the block shown in FIG. Code words “8”, “9”, in section “12” of data stored in 16
Let the data “10” be the original block number.
If the error data of only code words "6" and "8" cannot be corrected, the microprocessor 17 corrects code words "5" and "9" in section "12" of the data memory 16 and code word " Create an original block number by either "7" or "10".

By the way, in FIG. 1, original block numbers 7a and 7b are written consecutively in the same section, so for example, a data error occurs in sections "12" to "14" in FIG. A case may occur in which code words "6" to "10" are all error data and cannot be corrected. On the other hand, in the case of the second embodiment shown in FIG. 2, assuming that the ECC circuit 15 has the ability to correct up to 2 bytes of error data per code word, code word ” to section “14” code word “10”
Even if a data error occurs up to, the data 8a of code words "1" to "3" in section "1" of the data memory 16 can be used as the original block number. Conversely, from code word “1” of section “1” to section “3”
If a data error occurs up to code word "7" in data memory 16, data 8 in code words "8" to "10" in section "12" of data memory 16
b can be the original block number.

As described above, by writing a plurality of original block numbers in the data of the replacement block 4 and replacement area 2, even if a data error occurs, any one of the plurality of original block numbers 7a, 7b, 8a, Select one of 8b,
Or by combining them, the microprocessor 17 can detect the correct original block number. As a result, when erasing an original area, the original block and replacement block of the track to be erased in the original area are respectively erased, and furthermore, in the replacement area, a microprocessor is used to check whether or not the original track to be erased has been replaced based on the original track number. When the processor 17 detects and there is a block to be erased, it also erases the replacement area. At this time, the present invention can eliminate forgetting to erase or erroneously erasing the replacement area.

Furthermore, when reading the original area 1, if a reading error occurs between the original blocks 3-1 to 3-n, on a disc recorded by the method of the present invention, the replacement block 4 or replacement area 2 of that track is
Based on the original track number, the microprocessor 17 detects whether or not there is a change in data to be read between the replacement block 4 and the replacement area 2, and if there is, the error data in the original area 1 and the replacement block 4 are read. Alternatively, it becomes possible to accurately replace the data with the data in the replacement area 2.

In the embodiment of the present invention, a case has been described in which two original block numbers consisting of 3 bytes are written consecutively to the replacement block or replacement area, but three or more original block numbers may be written, and each byte may be scattered in the data. In this case, the ability to detect original block numbers due to data errors can be improved.

〔Effect of the invention〕

As described above, according to the present invention, when reading a replacement block or replacement area, the ability to detect the original block number written in the data is improved, and when erasing the original area, it is possible to avoid forgetting to erase the replacement area.
Erase mistakes can be prevented. Further, the data written in the replacement block or replacement area when reading the original area can be accurately replaced with the data in the original area, and data reliability can be improved.

[Brief explanation of drawings]

1 and 2 are diagrams showing respective embodiments of block configurations in which a plurality of original block numbers are written according to the method of the present invention, and FIG. 4 is a diagram illustrating the structure of one track on an optical disk medium, FIG. 5 is a diagram illustrating an example of the structure of one block, and FIG. 6 is a diagram illustrating an example of a reading circuit. It is a block system diagram. 1...Original area, 2...Alternative area, 3-
1 to 3-n...Original block, 4...Replacement block, 5...1 track, 7a, 7b, 8
a, 8b...Original block number, 13...
Demodulation circuit, 14...Block memory, 15...
ECC circuit, 16...data memory, 17...microprocessor.

Claims (1)

[Claims] 1 Divide the recording area on the recording medium into an original area and a replacement area, write data sequentially to tracks in the original area, and if an error occurs in one block when reading after writing, the data is written to the replacement block in that track. In a data recording method in which data is written to the alternate block and the alternate area respectively when errors exceeding a predetermined number of blocks occur, multiple original block numbers are written in the recorded data of the alternate block and the alternate area. A data recording method characterized by writing individual pieces.