JPH043590B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an optical disk device, and particularly to an optical disk device that controls positioning to sectors on a disk medium.

(Prior Art) Conventional magnetic disk devices are capable of rewriting the address section on a magnetic recording medium when it is unknown, and write deleted sector information if the address section is unknown even after rewriting. It was possible to perform such processing.

However, in optical disk devices, when manufacturing optical disk media, the address area is recorded by press processing, so it is impossible to rewrite the address area, and therefore, the address information in the address area is unknown. In this case, there was a drawback that it was impossible to read the sector.

(Objective of the Invention) An object of the present invention is to provide an optical disk device that eliminates the drawbacks of conventional optical disk devices and improves the reliability of information on an optical disk medium.

Another object of the present invention is to monitor both the address area of the optical disk medium and the address information of the data area to which address information has been added, and even if the address information of the address area is unknown, the sector is determined based on the address information of the data area. An object of the present invention is to provide an optical disk device that can correctly perform read processing.

(Structure of the Invention) According to the present invention, there is provided a disk medium configured with a sector format having an address area indicating a track address and a sector address, and a data area to which information indicating the track and sector address is added, and a disk medium on the disk medium. An optical disk device comprising a data processing circuit for recording and reproducing information, the first buffer circuit for reading address information in the address area, and the second buffer circuit for reading address information in the data area. and the third data that temporarily holds the data in the data area while reading the address information in the data area.
It includes a buffer circuit and an error correction circuit for information in the data area, and performs positioning control based on the address information of the first and second buffers during the sector read process, and performs positioning control based on the address information of the first and second buffers when the address information of the address area is unknown. In this case, there is obtained an optical disk device characterized in that sector positioning is performed based on the address information of the data area corrected by the error correction circuit.

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

FIG. 1 shows an optical disk device which is an embodiment of the present invention. In FIG. 1, one embodiment of the present invention is an optical disk device for recording information on or reproducing information from an optical disk medium having an address area and a data area, and an optical disk head 3.
1, a sense amplifier 32 that amplifies the signal from the head 31, a data discrimination circuit 33 that separates and demodulates the signal from the sense amplifier 32 into data information and address information, and a serial signal from the data discrimination circuit 33. A serial/parallel conversion circuit 34 that converts a signal into a parallel signal, a buffer circuit 35 that corrects errors and temporarily stores data information from the conversion circuit 34, and a buffer circuit 35 that corrects errors and temporarily stores information in the data area from the conversion circuit 34. A buffer circuit 36 for storing and the buffer circuits 35 and 3
a select circuit 37 for selecting one of 6 and 6;
A first buffer circuit 40 that inputs the address information of the address area from the conversion circuit 34, and a second buffer circuit 39 that inputs the address information of the data area extracted from the select circuit 37.
and a third buffer circuit 38 that inputs data information in the data area, and an error correction code (ECC) for the input data via the third buffer circuit 38.
an error correction code addition circuit 43 that adds the correction code; and a modulation circuit 42 that modulates the data to which the correction code has been added in order to supply it to the optical disk head.
It also includes a control microprocessor 41 that controls these circuits.

FIG. 2 shows a sector format on a disk medium in one embodiment of the present invention. In FIG. 2, the optical disk medium used in the optical disk device of this embodiment is composed of a plurality of tracks and a plurality of sectors provided on each track.
The sector format consists of an address area 50 and a data area 51. The address area 50 records a track address and sector address information, and the data area 51 stores data information 53 and the track address and sector address added thereto. Sector address information 52 is recorded therein. Note that a synchronous pull-in pattern is naturally added to both areas.

This optical disk device has an address area and a data area as sector formats on the disk, and information indicating track addresses and sector addresses is added to the data area. It monitors information in real-time processing and has an error correction function for the data area, so that even if the address information in the address area is unknown, it can be processed using the correct address of the data area that has undergone error correction processing. It is.

Referring again to FIG. 2, the operation of this embodiment will be described. The output signal read from the optical disk head 31 enters the sense amplifier 32 and is converted into a digital signal. Next, the digital signal is demodulated by the data discrimination circuit 33 and converted into byte data by the serial/parallel conversion circuit 34. Of this byte data, address information in the address area is input to the first buffer circuit 40 . The control microprocessor circuit 41 determines the sector address based on the address information of the first buffer circuit 40.

On the other hand, the information in the data area is stored in the error correction and buffer circuit 35 or the error correction and buffer circuit 3.
6 are input alternately. The corrected data is selected by the selector circuit 37, the address information of the data area is input to the second buffer circuit 39, and the data information of the data area is input to the third buffer circuit 38. The address information of the second buffer circuit 39 is stored in the control microprocessor circuit 4.
1 and the address information in the address area is unknown, the sector is determined based on the address information in the data area.

The third buffer circuit 39 is used to perform data transfer without any problem even if a time loss occurs for confirming the address information of the second buffer circuit.

In addition, during a write operation, a correction code is added to the input data by an error correction code (ECC) adding circuit 43, and the modulation circuit 42 modulates the input data.
Transfer the data to be recorded to the head. The address information of the data area can be generated from the control microprocessor circuit, or can be sent together with the data from the host device.

(Effects of the Invention) As explained above, the present invention adds address information to the data area as a sector format, thereby enabling positioning based on address information in the address area and correct error-corrected information in the data area. This has the effect of increasing the reliability of the data since positioning can be performed accurately.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an optical disk device according to an embodiment of the present invention, and FIG. 2 is a diagram showing a sector format on an optical disk medium used in an embodiment of the present invention. 31... Optical disk head, 32... Sense amplifier circuit, 33... Data discrimination circuit, 34
...Serial/parallel conversion circuit, 35...Error correction and A buffer circuit, 36...Error correction and B buffer circuit, 37...Select circuit, 38...
...Third buffer circuit, 39...Second buffer circuit, 40...First buffer circuit, 41...Control microprocessor circuit, 42...Modulation circuit, 43...Error correction code (ECC) Additional circuit.

Claims (1)

[Claims] 1. A disk medium constituted by a sector format having an address area indicating a track address, a sector address, and a data area to which information indicating the track and sector address is added, and data for recording and re-correcting information on the disk medium. an optical disk device having a processing circuit, a first buffer circuit for reading address information in the address area, a second buffer circuit for reading address information in the data area, and an address in the data area; a third data buffer circuit for temporarily holding data in a data area during information reading; and an error correction circuit for information in the data area; Positioning control is performed based on the data area, and when the address information of the address area is unknown, sector positioning is performed based on the address information of the data area corrected by the error correction circuit. Optical disk device.