JPS61177680A - Optical disk processing device - Google Patents

Abstract

PURPOSE:To recognize flag information with a high reliability and to improve a data processing efficiency by dividing a detecting level of various kinds of flag information. CONSTITUTION:When the equivalent track and a sector in a data area 30 of optical disk media 11 are searched and faulty sector flag information is not detected by flag detecting circuits 61-6n in a flag area 21, said data are trans ferred to a higher order device 1. At such a case, detecting levels 1-n are respectively set, the threshold of the faulty sector flag is changed, in case of the detecting level l(1<=l<=n) or above, said sector in the area 30 is judged to be faulty, a spare track area 32 is searched and said data are transferred. In case of the detecting level of less than l, said sector in the area 30 is not faulty, the omitted place is judged to be present on an optical disk 11 and said sector is transferred.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc processing device, and more particularly to an optical disc processing device related to a flag information recognition method in an optical disc processing device for exchanging information processing data.

[Conventional technology]

Conventionally, in an optical disk processing device, the contents of a flag indicating the usage information of each sector (for example, indicating that the sector is a bad sector, a written sector, an unnecessary deleted sector, etc.) Judgment was made and data processing was performed.

[Problem that the invention seeks to solve]

In the conventional optical disk processing device described above, since the optical disk medium has a high error rate, an error correction code is added to normal data, and error correction is performed during playback to ensure the reliability of the data. . However, there is no error correction code for the flags that indicate the usage information of each sector, and the flag information is determined based on the presence or absence of data.
If the missing part of the medium is in the 7 lag area, the flag information will be incorrectly determined, resulting in a drawback that the reliability of data processing such as reproduction of illegal data will deteriorate.

The present invention provides an apparatus that solves the above problems.

[Means for solving problems]

The present invention provides means for determining a flag area in which flags indicating various usage information of sectors of an optical disc medium are recorded;
An optical disc processing apparatus characterized by comprising means for recording and detecting various flag information recorded in the flag area, and means for dividing detection of the flag information.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an optical disk processing apparatus according to an embodiment of the present invention. In FIG. 1, this embodiment includes a data buffer 2 for transmitting and receiving data to and from a host device 1, a data read system 7 for reading data from an optical disk medium 11, and a data read system 7 for discriminating read signals from the data read system 7. A discrimination circuit 4, a demodulation circuit 3 that demodulates the discriminated data, and a flag detection circuit 6 that detects various flag information. ~
6, and a flag creation circuit 9 that creates the flag information,
It includes a modulation circuit 8 that modulates write data from the host device 1 and a data write system 10 that writes the modulated data from the modulation circuit 8 onto an optical disk medium 11.

FIG. 2 shows the sector format. In FIG. 2, each sector has an index section 20 that is a glyph formatted area that indicates the position of data, a flag area 21 that stores various flag information, and a data section 22 that indicates an area for data. There is.

FIG. 3 shows one embodiment of media usage. In FIG. 3, the horizontal direction indicates sectors and the vertical direction indicates tracks. It has a data area 30 for reading and writing normal data, a spare sector area 31 for saving bad sectors on each track, and a spare track area 32 for keeping a spare in case the spare sector area becomes full and overflows. .

FIG. 4 is a flowchart showing the read operation in the main control section 5 of FIG. 1 in this embodiment.

During a read operation, a corresponding track and sector in the data area 30 is searched, and defective sector flag information is detected in the flag area 21 by the flag detection circuit 6. If the data is not detected at ~6n, the corresponding data is transferred to the host device. If the flag detection circuit 6. -6n, if any of them is detected, the spare sector area 31 is searched for the corresponding data and the data is transferred; however, if there is no corresponding data,
It is determined which one of the flag detection circuits 61 to 6n has been detected. That is, the flag detection circuit 6° to 6
Set detection levels 1 to n for n, vary the threshold of the bad sector flag, and set detection level t (1≦t≦n
), the corresponding sector in the data area 3o is determined to be a bad sector, and the spare track area 32 is searched, and if the corresponding data is found, the data is transferred; if not, the process ends abnormally.

If it is less than the detection level, it is determined that the corresponding sector in the data area 3o is not a defective sector, but a missing part on the optical disc, and the corresponding sector is transferred.

As for the method of dividing the detection level, there are two methods: one based on the difference in the threshold voltage level of the flag information, and one based on the count value after counting the individual information of the flag information.

〔Effect of the invention〕

As described above, according to the present invention, by dividing the detection levels of various flag information, reliable flag information can be recognized and data processing efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a sector format used in this embodiment,
FIG. 3 is a diagram showing an example of using the medium, and FIG. 4 is a flowchart showing the operation of this example. DESCRIPTION OF SYMBOLS 1... Upper device, 2... Buffer, 3... Demodulation circuit, 4... Data discrimination circuit, 5... Main control part, 6.
~6n...Flag detection circuit, 7...Data reading system, 8...Modulation circuit, 9...Flag creation circuit, 10.
...Data writing system, 11...Optical disk medium, 2o
...index section, 21...flag area, 22.
...Data section, 3o...Data area, 31...Spare sector area, 32...Spare track area

Claims (1)

[Claims] (1) In an optical disk processing device for information processing data exchange, means for determining a flag area in which flags indicating various usage information of sectors of an optical disk medium are recorded, and recording various flag information recorded in the flag area. An optical disc processing device comprising: means for detecting and detecting the flag information; and means for dividing the detection of the flag information.