JPS6124060A - Optical disc controller - Google Patents

Abstract

PURPOSE:To attain verification in a short time by constituting an optical disc controller with a storage circuit and an optical disc processor. CONSTITUTION:An optical disc controller 100 consists of a storage circuit 110 and an optical disc processor 120. The optical disc processor 120 checks a defective sector to write data at first. If a sector is defective, an address of the defective sector stored in the storage circuit 110 is read and compared with an address of a defective sector read from the optical disc device. As the result of comparison, when the addresses are coincident, the optical disc processor 120 reads the address from the storage circuit 110, locates the optical disc device to a sector on an alternate track corresponding to the defective sector and applies verification without accessing the alternate sector.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an optical disc control device that operates according to instructions from a central processing unit to control an optical disc device, and particularly relates to a verification operation for data written on alternate tracks. This is related to the control part.

``Prior Art'' Conventionally, a control method for verifying data written on alternate tracks by an optical disk control device was as follows. In other words, as shown in Figure 1, a track on an optical disk stores a sector consisting of a data section and a header section indicating the address of this data block, and the data writing operation did not end normally. If so, it is displayed that the sector is a bad sector. In a verify operation after writing data, that is, an operation to check whether the written data is correct, the optical disk control device reads the header section and detects a bad sector. If the header is read and a comparison is not made to see if there is a replacement sector corresponding to the bad sector, the written data is A verification operation was being performed for the Therefore, every time a bad sector is detected during a verify operation, the safe! Even without it, the replacement sector was accessed, resulting in wasted time.

An object of the present invention is to memorize the address of the defective sector and the sector on the alternate track corresponding to the defective sector when writing data to a sector on the alternate track corresponding to the defective sector, and perform a verification operation on the written data. At times, when a bad sector is accessed, the above drawback is removed by directly performing a verify operation on the sector on the replacement track without accessing the replacement sector on the same track as the bad sector. An object of the present invention is to provide an optical disc control device that can shorten the processing time of a verify operation for data written to a sector.

"Means for Solving the Problems" According to the optical disk control device of the present invention, there is provided a storage circuit that stores addresses of bad sectors and sectors on alternate tracks corresponding to the bad sectors, and When writing data, if the write operation does not end normally, a bad sector flag is written, the sector is designated as a bad sector, a replacement sector is accessed in place of the bad sector, and the replacement sector is When there is no sector that can be used as a substitute, a seek operation is performed to the alternate track, data is written to the sector on the alternate track, and the addresses of these defective sectors and sectors on the alternate track are stored in the memory circuit. If the sector to be verified is a bad sector during a subsequent verify operation, the address of the bad sector read from the optical disk device and the address of the bad sector stored in the storage circuit are compared, and both addresses are determined. If they match, the address of the sector on the alternate track corresponding to the defective sector stored in the memory circuit is retrieved, and the address of the sector on the alternate track is located without accessing the alternate sector. death,
It consists of an optical disk processing device that performs a verify operation on written data.

"Example" Next, the present invention will be explained in detail with reference to the drawings.

In FIG. 2 showing an embodiment of the invention, an optical disc control device 100 of the invention is comprised of a storage circuit 110 and an optical disc processing device 120. The operation of this optical disc control device 100 will be explained with reference also to the flowchart in FIG. The optical disk processing device 120 receives an instruction to write data to the optical disk device from the central processing unit (not shown) through a line 200, and writes the data to the optical disk device (not shown) through a line 203 in step S.

In step S2, it is checked whether the writing has ended abnormally, and if the writing operation has not ended normally, the line 2 is checked in step S8.
03, the optical disk device 120 instructs the optical disk device to write a bad sector flag, and marks the currently accessed sector as a bad sector.In step S4, the optical disk processing device 120 reads the header part of the replacement sector from the optical disk device through line 204, and marks it as a bad sector. It is checked whether there is a spare sector that can be used as a substitute for the bad sector. If there is not, in step S5, the address of the sector on the spare track that can be used as a substitute for the defective sector is sent through the line 203, and the optical disk device is activated. The defective sector is positioned at the sector on the replacement track corresponding to the defective sector, data is written to the sector in step S6, and the defective sector and the replacement track corresponding to the defective sector are written to the storage circuit 110 through the line 201 in step S7. The address of the sector on the track is stored.If there is a writeable alternate sector in step S4, data is written in the alternate sector in step S8.

In order to perform a verify operation after writing data, in step S, the optical disk processing device 120 sends the address of the sector accessed for the first time to perform a data write operation through the line 203, and positions the optical disk device. Connect the header part through the wire 204 and proceed to step S.

Check if it is a bad sector. If it is a bad sector, the address of the bad sector stored in the storage circuit 110 is read out through line 202 in step S□1 and compared with the address of the bad sector read out from the optical disk device through line 204. As a result of the comparison in step S1□, if the addresses match, in step 818 the optical disk processing device 120 connects the storage circuit 110 to the line 202.
By reading the address of the sector on the alternate track corresponding to the bad sector through the line 203 and sending the address of the sector on the alternate track through the line 203 in step 814, the optical disk device is placed on the alternate track corresponding to the bad sector. The verification operation is performed without accessing the alternate sector. In step 81G, if the sector is not defective, a verify operation is performed on the sector. If the addresses do not match in step 5ill, the address of the alternate sector is sent through line 203 in step 81G, thereby positioning the optical disk device in the alternate sector and performing a verify operation.

``Effects of the Invention'' As described above, the present invention configures an optical disk control device using the storage circuit 110 and the optical disk processing device 120, thereby performing a verification operation on data on an alternate track and an access to an alternate sector. This has the advantage that the verification operation can be executed in a shorter time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a sector format of an optical disc device, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a flowchart showing an example of the operation of the embodiment of the invention. 100: Optical disk control device t, 110: Storage circuit, 1
20: Optical disk processing device. Patent applicant: NEC Corporation Representative: Takuo Kusano 1 Figure 72 Cause

Claims (1)

[Claims] (1) Connected to a central processing unit, operates according to instructions from the central processing unit, and controls the optical disk device;
In addition, if the write operation does not end normally when writing data to a sector on the optical disk medium according to instructions from the central processing unit, a bad sector flag is written to that sector and a replacement sector on the same track is accessed as a bad sector. , when there is no sector in the replacement sector that can be used as a replacement for the bad sector, perform a seek operation on a replacement track that can be used as a replacement for the bad sector, write data to the sector on the replacement track, and then , an optical disk control device having a function of performing a verify operation on written data in order to check whether the written data is correct; , If the write operation does not end normally when writing data according to instructions from the central processing unit, a bad sector flag is written to mark the sector as a bad sector, and a replacement sector on the same track is accessed in place of the bad sector. However, when there is no sector in the replacement sector that can be used as a replacement for the bad sector, a seek operation is performed on the replacement track that can be used as a replacement for the bad sector, and data is written to the sector on the replacement track. , the address of the defective sector and the sector on the alternate track corresponding to the defective sector is stored in the storage circuit, and when the sector to be verified is a defective sector during the subsequent verify operation, the address of the defective sector read from the optical disk device is stored. The address of the sector is compared with the address of the bad sector stored in the memory circuit, and if the addresses match, the address of the sector on the alternate track corresponding to the bad sector stored in the memory circuit is retrieved and the sector is replaced. 1. An optical disk control device comprising: an optical disk processing device that positions a sector on an alternate track without accessing the sector and performs a verify operation on written data.