JPS60258762A - Optical disc device - Google Patents

Abstract

PURPOSE:To read a data even when address information at an address area is not clear by providing a means of adding address information to a data area and a defective sector mark area between the address area and the data area. CONSTITUTION:The address information of the address area enters the 1st buffer circuit 10. A control microprocessor circuit 11 discrimnates a sector address depending on the content of the 1st buffer circuit 10. The address information of the data area is inputted to the 2nd buffer circuit 9, the data information of the data area is inputted to the 3rd buffer circuit 8 and held temporarily for the confirmation of information of the 2nd input a buffer circuit 9. The address information of the 2nd buffer circuit is read by the control microprocessor circuit 11 and even when the address information of the address area is not clear, the sector is discriminated by the address information of the data area and correct sector processing is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an optical disk device, and more particularly to an optical disk device that performs sector positioning, data processing, defective sector processing, etc. during information recording and reproduction.

(Prior art) In conventional optical disk devices, a method is used in which the address area is recorded during press processing during the manufacture of the optical disk medium, so rewriting is impossible and the address information in the address area is unknown. In some cases, the positioning and data processing of the sector becomes impossible. In addition, in this optical disk device, processing of bad sectors was managed by software from the upper level device, so all information regarding the sector of the corresponding track was stored.

This method has drawbacks such as the need for software management and the inability to improve processing speed.

(Object of the Invention) The object of the present invention is to eliminate such drawbacks in conventional optical disk devices, and to read data even when the address information in the address area is unknown by monitoring the address information in the address area and the data area. The object of the present invention is to provide an optical disk device that makes it possible to do this.

Another object of the present invention is to provide an optical disc that makes it possible to read correct data from alternative sectors by detecting bad sector marks.

(Structure of the Invention) According to the present invention, an address area having information indicating a track conflict address and a sector address, a defective sector mark area in which all defective sector marks are written, and a data area to which information indicating the track and sector addresses are added are provided. An optical disk device comprising: a disk medium configured with a sector former, and a data processing circuit for recording and reproducing information on the disk medium; a second buffer circuit that holds address information of a data area, an error correction circuit for the information of the data area, and a bad sector mark detection circuit that detects a bad sector mark.

and a third buffer circuit that temporarily holds data information in the data area, and positions the sector based on the address information of the first and second buffer circuits during sector processing, and when the address information is unknown. The system positions sectors based on address information of the data area corrected by the error correction circuit, and performs alternative sector processing for bad sectors detected by the bad sector mark detection circuit. An optical disk device characterized by the following features is obtained.

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

FIG. 3 shows an optical disk device according to an embodiment of the present invention. In FIG. 1, one embodiment uses a track address as a sector format on a disk.

An optical disk device that processes sector-format disk media that has an address area showing all sector addresses, a bad sector mark area where bad sector marks are written, and a data area with information indicating track and sector addresses. , sense amplifier circuit 2.
Data discrimination circuit 3° and serial-parallel conversion circuit 4
is used as the readout system, and the error correction code addition circuit [4. A first buffer circuit IO includes a microprocessor 11 that serves as a writing system for the modulation circuit 13 and the defective sector e-mark generation circuit 15' and controls them, and also reads address information in the address area during sector read processing; a second buffer circuit 9 for reading address information in the data area; error correction circuits 5 and 6 for information in the data area; a select circuit 7 for selecting either of the error correction circuits 5 or 6; It includes a mark detection circuit L2 and a third buffer circuit 8 that temporarily holds data information in the data area.

This optical disk device monitors the address information of the address area and data area in the sector former on the disk in real time, temporarily holds the data in the data area during these address monitoring times, and has an error correction function for the data area. When the address information of the address area is unknown, processing is performed using the address information of the data area, and when a defective sector mark is detected, alternative sector processing is performed based on the address information of the data area of the alternative sector.

FIG. 2 shows a sector formatter on a disk medium used in one embodiment of the present invention. In FIG. 2, the sector format consists of an address area 20, a data area 21, and a defective sector/mark area 22, which are combined into one
Sectors are configured.

Track address and sector address information are recorded in the address area 20, and data information 24 and track address and sector address information 23 are recorded in the data area 21.

Naturally, a synchronization pull-in pattern 25 is also added to both areas 20 and 21. A mark is written in the defective sector mark area 22 when the sector is defective.

Referring again to FIG. 1, this optical disk device inputs the output signal read by the optical disk head 1 to the sense amplifier circuit 2, converts it into a digital signal, and then demodulates it to the data discrimination circuit 3. Further, the serial to parallel conversion circuit 4 converts the data into byte data. Address information of the address area enters the first buffer circuit 10. Control microphone log processor circuit 1 is this first buffer circuit'
jlJ531J kN.

Moreover, the defective sector/mark detection circuit 12 sends all the output signals of the sense amplifier circuit 2 to the control microprocessor circuit L1 if there is a defective sector φ mark.

Information in the data area is alternately input to error correction and buffer circuit 5 and error correction and buffer circuit 6. The respective corrected data are selectively taken out by the select circuit 7.

At this time, the address information of the data area is input to the second buffer circuit 9, the data information of the data area is input to the third buffer circuit 8, and is temporarily held while the information of the second buffer circuit ``0'' is confirmed. Ru.

The address information of the second buffer circuit 10 is read out by the control microprocessor circuit 11, and even if the address information in the address area is unknown, the sector can be determined from the address information in the data area, making it possible to process the sector correctly. .

When the third buffer circuit can correctly determine the address information of the second buffer circuit, the data in the buffer is transferred.

When writing, an error correction code (BC) is added to the input data.
C) A correction code is added to the additional circuit 14, and the modulation circuit [3] modulates the data to be recorded on the optical disk. Further, if the sector is determined to be a bad sector after writing, the bad sector mark generation circuit 15 writes a υ bad sector mark.

The address information of the data area can be generated by the control microprocessor circuit or sent together with the data by the host device.

Next, FIG. 3 shows the sector column format on the track. In FIG. 3, in this embodiment, if a bad sector mark 25 is present in the 30th ON source sector (primary sector) during the read process, it is detected by a bad sector mark detection circuit L2.

In "control microprocessor circuit" 1, alternative sector 31
Based on the address information of the data area, the data of the alternative sector corresponding to the primary sector is correctly read and processed.

In this way, in this embodiment, by providing a means for adding address information to the data area and a defective sector mark area between the address area and the data area, it is possible to distinguish between the address head and the data area during sector read processing. In order to be able to monitor both address information, even if the address information of the address area is unknown, sector read processing is possible using the address information of the data area where the error has been corrected, and if there is a bad sector mark before reading the data area. , it is possible to read correct data from the alternative sector based on the address information of the data area of the alternative sector.

(Effects of the Invention) As explained above, the present invention enables positioning based on address information in an address area and positioning based on error-corrected address information in a data area, and furthermore, uses a defective sector mark to perform alternative sector processing within the device. By making it possible to improve the data reliability of optical disk devices,
Faster processing? It has the effect of making it possible.

[Brief explanation of drawings]

Figure 1 shows an optical disk device in one embodiment of the present invention, and Figure 2 shows the sectors and sectors of the optical disk used in this embodiment.
FIG. 3 is a diagram showing the sector string format on a track in this embodiment. 1... Optical disk head, 2... Sense-7 amplifier circuit, 3... Data discrimination circuit, 4
・・・・・・Serial, parallel conversion, 5, 6, old...
Error correction and buffer circuit, 7...Select circuit, 8...Data buffer circuit (third buffer circuit), 9...Second buffer circuit, 10...・
...First buffer circuit, 11...Control microprocessor circuit, 12...Bad sector mark detection circuit, 13...Mountain/modulation circuit, 14...
ECC (error correction code) additional circuit, 15...
- Bad sector mark generation circuit. Agent Patent Attorney Susumu Uchihara 1 ＼ ゛＼－～

Claims (1)

[Claims] A disk medium configured with a sector format having an address area having information indicating a track Q address t sector address, a bad sector mark area in which a bad sector mark is written, and a data area having information indicating the track and sector address; an optical disk device comprising a data processing circuit for recording and reproducing information on a medium; a first buffer circuit for retaining all address information in an address area during sector read processing;
a second buffer circuit that holds address information of the data area; an error correction circuit for the information of the data area; a bad sector mark detection circuit that detects a bad sector mark; and a third buffer circuit that temporarily suspends data information sound of the data area. buffer circuit, and positions the sector based on the address information of the first and second buffer circuits during sector processing, and if the address information of the address area is unknown, it is corrected by an error correction circuit. The optical system is characterized in that the sector is positioned based on the address information of the data area that has been detected, and furthermore, the defective sector mark detection circuit performs alternative sector processing for the defective sector detected by the defective sector mark detection circuit. disk device.