JPH05182254A - Inspection device for disk shaped information recording medium - Google Patents

Abstract

PURPOSE:To obtain an inspection device for disk shaped information storage medium able to inspect plural disk shaped information recording media in parallel by controlling plural disk inspecting parts with a central processing part. CONSTITUTION:Plural disk inspecting parts 33-39 are provided and connected with the central processing part 32 controlling these disk inspection parts 33-39 through an interface 32. These disk inspection parts 33-39 have functions of storing inspection data, recording inspection data, reproducing inspection data, detecting errors, storing of a result of detecting, recording defective sector on a specified tracks, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc information recording medium inspection device such as an optical disc.

[0002]

2. Description of the Related Art FIG.
FIG. 5 is a block diagram showing a conventional disc-shaped information recording medium inspecting apparatus disclosed in Japanese Patent Publication No. JP-A-H05-26187, and FIG. 5 is a flowchart showing its operation. In the figure, 1 is an inspection data writing station, 2 is an inspection data reading station,
3 is an erasing station, 4 is a defective sector writing station, 6a to 6d are optical disks, 7a to 7d are turntables, 8a to 8d are drivers, 9a to 9d are servomotors, 10a to 10d are heads, and 10a is a writing head. 10b is a read head, 10c is an erase head, and 10d is a write head. Furthermore, 11a-
11d is a head feeding mechanism, 12a to 12d are CPUs, 1
Reference numeral 3 is an inspection data memory, 14 is a data comparison circuit, 15 is a system controller, 16 is a buffer memory for storing defective portion addresses, 17 is an additional track, and 18 is an A / D converter.

Next, the operation of this device will be described with reference to FIG. In the inspection data writing station 1,
The data in the inspection data memory 13 is written in the disc-shaped information recording medium (step 20). Next, the inspection data reading station 2 reproduces the disc-shaped information recording medium which has been processed by the inspection data writing station 1 (step 21). The reproduced data and the data in the inspection data memory 13 are compared by the data comparison circuit 14 (step 2).
2, 23). If the result is a mismatch, the track and sector addresses indicating the mismatch are detected (step 25) and recorded in the defective part address storing buffer memory 16 (step 27). If they match, the write data is erased (step 24). In the erasing station 3, the recording data of the disc-shaped information recording medium which has been processed in the inspection data reading station 2 is erased in steps 24 and 26. When the inspection data reading station 2 has a discrepancy in the defect data writing station 4, the track and sector address of the sector having a discrepancy in a predetermined track of the disc-shaped information recording medium are written (step 27). The disc-shaped information recording medium is inspected by the above processing procedure.

[0004]

Since the conventional disc-shaped information recording medium inspection apparatus is constructed as described above, the stations 1 to 4 can be operated in parallel.
If the process of the previous process is not completed, the process of the next process cannot be performed, and the disc-shaped information recording medium must be set in the corresponding station for each process, which requires a long inspection time. Further, since this inspection apparatus only detects defective sectors, there is a problem that the defect rate of the inspected disk-shaped information recording medium cannot be inspected.

The present invention has been made to solve the above problems, and an inspection apparatus for a disc-shaped information recording medium capable of performing inspection in parallel by controlling a plurality of disc inspection units by one central processing unit. The purpose is to get.

Further, it is possible to obtain a disc-shaped information recording medium inspection apparatus capable of detecting a sector having an error of a specified value or more, writing a track of a defective sector and a sector address to a predetermined track, and inspecting a defect rate. It is an object.

[0007]

A disc-shaped information recording medium inspection apparatus according to the present invention is a data storage unit for storing inspection data of a disc-shaped information recording medium, and records the inspection data on the disc-shaped information recording medium. Data recording means, error detection means for comparing the reproduced data reproduced from the inspection data with the recorded inspection data to detect an error in the reproduced data on the disc-shaped information recording medium, and storing the error detection result. A plurality of disk inspection units configured by the error storage means, a central processing unit for controlling the disk inspection unit, and an interface for connecting the disk inspection unit and the central processing unit are provided.

Further, data storage means for storing the inspection data of the disc-shaped information recording medium, data recording means for recording the inspection data on the disc-shaped information recording medium, reproduction data obtained by reproducing the inspection data and recording. Error detecting means for comparing the inspection data thus detected to detect an error in the reproduction data of the disc-shaped information recording medium,
A plurality of disk inspection units each including an error storage unit for storing the number of erroneous data and an erroneous sector equal to or more than a specified value, and an error recording unit for recording the address of the erroneous sector on a predetermined track; It is provided with a central processing unit for controlling the disc inspection unit and an interface for connecting the disc inspection unit and the central processing unit.

[0009]

In the disc information recording medium inspecting apparatus constructed as described above, when the disc inspecting section receives the inspecting command from the central processing section, it receives the inspecting recording data and disconnects the interface. After that, the disc inspection unit starts the inspection independently of the central processing unit. During this period, communication with the central processing unit is not performed, and all the inspection processes are performed independently by the plurality of disk inspection units. When the error detection inspection is completed, the disk inspection unit issues a reconnect request to the central processing unit to notify that the inspection is completed. After receiving this notification, the central processing unit reads out the inspection result from the disk inspection unit.

Further, the error detection is performed by the error detection circuit of the disk inspection unit at the time of reproducing the inspection data, and the number of errors and the address of the sector having an error equal to or larger than a predetermined value are stored.

[0011]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 31 is a host computer which is a central processing unit and controls the disk inspection unit and performs data processing by, for example, a SCSI interface. 32 is SC
SI interface buses (hereinafter referred to as SCSI buses) 33 to 39 are, for example, seven disk inspection units, and actually inspect the disc-shaped information recording medium. Further, 40 is a printer for outputting the inspection result, and 41 is a floppy disk drive for recording the inspection result.

FIG. 2 is a flowchart showing the operation of the host computer 31, and the operation of the host computer 31 will be described based on this flowchart. A disc-shaped information recording medium to be inspected is set in each of the disc inspecting units 33 to 39. In step 50, the host computer 31 moves the disk inspection unit 33 to the disk inspection unit 39.
The inspection command is issued in sequence to and the inspection is started. This inspection command includes a series of operation sequences such as inspection recording data transfer, erasing, recording, error detection, and recording of defective sectors on a predetermined track. Next, the host computer 31 sequentially transfers the recording inspection data from the disc inspection unit 33 to the disc inspection unit 39 (step 5).
1). At this time, the inspection data is transferred for one sector, for example, and the disk inspection units 33 to 39 repeatedly record the inspection data for one sector. After the transfer, the SCSI bus is disconnected to disconnect the disk inspection units 33 to 39 from the host computer 31.

At step 52, each disk inspection unit 33-
Inspection at 39. The disk inspection units 33 to 39 that have completed the data transfer disconnect the SCSI bus 32 and become independent as shown in step 51. Each disk inspection unit 3
The host computer 31 and the disk inspection units 33 to 39 do not communicate until the inspection in 3 to 39 is completed.

When the inspection by each of the disk inspection units 33-39 is completed, the disk inspection units 33-39 sequentially issue a reconnect request to the SCSI bus 32 in step 53 to notify the host computer 31 of the completion of the inspection. When the inspections of all seven disc inspection units 33 to 39 are completed,
The host computer 31 sequentially reads out the inspection results of the disk inspection unit 39 from the disk inspection unit 33 (step 5).
4). The inspection result is recorded in the floppy disk drive 41 and output to the printer 40 (step 55).

FIG. 3 is a flow chart showing the operation of each of the disk inspection units 33 to 39. Step 5 in FIG.
The second part is described in detail. The operation of the disk inspection units 33 to 39 will be described based on this flowchart. In this embodiment, the disk inspection unit 33 to the disk inspection unit 39 all perform the same operation, so only the operation of the disk inspection unit 33 will be described.

First, in step 60, the disk inspection unit 33.
Starts receiving the inspection command from the host computer 31, and first receives the inspection data for one sector from the host computer 31 and stores it. Step 6
In step 1, it is judged whether or not there is an erase request in the inspection command, and if there is a request, the data already recorded on the disc-shaped information recording medium is erased (step 62). Whether to erase depends on the type of disc-shaped information recording medium.

Next, the transferred inspection data for one sector is repeatedly recorded. Therefore, the same data is recorded in all sectors (step 63). Next, in step 64, an error is detected. The error detection in step 64 is performed by reproducing the recorded inspection data and comparing it with the stored original inspection data. This error detection is detected in real time by the error detection circuit in the disc inspection unit 33 when the inspection data is reproduced. What is detected as an error is the track number and sector address of the sector in which the number of errors and the number of errors exceeds the specified value.
Store in internal memory. In this process, it is determined in step 65 whether there is a sector having an error equal to or larger than a specified value. If there is an error, the track and sector address of this sector are recorded on a predetermined track (step 6).
6). When the inspection is completed, as shown in step 67,
The disk inspection unit 33 issues a reconnect request to the SCSI bus 32 and notifies the host computer 31 of the end of the inspection.

As described above, this embodiment is configured so that communication such as data transfer is not performed with the host computer 31 at the time of recording and reproducing, and the error detection circuit in the disc inspection unit 33 makes an error in real time. Since the detection is performed, the inspection is completed within the running time of the inspection truck. Furthermore, according to this embodiment, one host computer can control a maximum of seven disc inspection units, and a plurality of disc-shaped information recording media can be inspected in parallel. Moreover, since the inspection is configured to be completed within the running time of the inspection truck, many disc-shaped information recording media can be inspected in a short time, and an inexpensive inspection system can be provided.

Further, in this embodiment, the detection of the sector having an error more than the specified value and the recording of the track and the sector address of the defective sector to the predetermined track are carried out. The device is obtained.

In the first embodiment, since the central processing unit and the disk inspection unit are connected by the SCSI interface bus, it is composed of seven disk inspection units, but other interfaces are used. Although the number of disk inspection units is different when using a disk, the same effect as that of the above-described embodiment can be obtained if the disk inspection units are composed of a plurality of disk inspection units.

[0021]

As described above, according to the present invention, data storage means for storing inspection data of a disk-shaped information recording medium,
Data recording means for recording inspection data on the disc-shaped information recording medium, comparing reproduction data reproduced from the inspection data with recorded inspection data to detect an error in reproduction data on the disc-shaped information recording medium. A plurality of disk inspection units each including an error detection unit and an error storage unit that stores an error detection result, a central processing unit that controls the disk inspection unit, and an interface that connects the disk inspection unit and the central processing unit. Since a single central processing unit controls a plurality of disk inspection units, a disc-shaped information recording medium inspection device capable of performing inspections in parallel can be obtained.

Further, data storage means for storing inspection data of the disc-shaped information recording medium, data recording means for recording inspection data on the disc-shaped information recording medium, and reproduction data for reproducing the inspection data. Error detection means for detecting the error in the reproduction data of the disc-shaped information recording medium by comparing the recorded inspection data with the error storage means for storing the number of erroneous data and the sector having an error of a specified value or more. And a plurality of disk inspection units configured by error recording means for recording the address of an erroneous sector on a predetermined track, a central processing unit for controlling the disk inspection units, and the disk inspection unit and the central processing unit are connected. Since the interface is provided, in addition to the above effects, there is an effect that a disc-shaped information recording medium inspection device capable of inspecting the defect rate can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an inspection device for a disc-shaped information recording medium according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of a central processing unit according to the first embodiment.

FIG. 3 is a flowchart showing the operation of the disk inspection unit according to the first embodiment.

FIG. 4 is a block diagram showing a conventional disc-shaped information recording medium inspection device.

FIG. 5 is a flowchart showing an operation of a conventional disc-shaped information recording medium inspection device.

[Explanation of symbols]

 31 central processing unit 32 interface 33 disc inspection unit 1 34 disc inspection unit 2 35 disc inspection unit 3 36 disc inspection unit 4 37 disc inspection unit 5 38 disc inspection unit 6 39 disc inspection unit 7

Claims (2)

[Claims] 1. A data storage means for storing inspection data of a disc-shaped information recording medium, a data recording means for recording the inspection data on the disc-shaped information recording medium, and a reproduction for reproducing the inspection data. A plurality of disc inspecting units each including an error detecting means for comparing data with the recorded inspection data to detect an error in the reproduction data of the disc-shaped information recording medium, and an error storing means for storing the error detection result. An inspection device for a disc-shaped information recording medium, comprising a central processing unit for controlling the disc inspection unit, and an interface for connecting the disc inspection unit and the central processing unit. 2. A data storage means for storing inspection data of a disc-shaped information recording medium, a data recording means for recording the inspection data on the disc-shaped information recording medium, and a reproduction for reproducing the inspection data. Error detecting means for comparing data and recorded inspection data to detect an error in reproduced data on the disk-shaped information recording medium, error for storing sectors having an error number of errors and a specified value or more A plurality of disk inspection units each including a storage unit and an error recording unit that records an address of an erroneous sector on a predetermined track, a central processing unit that controls the disk inspection units, the disk inspection unit and the central unit. A disc-shaped information recording medium inspection device having an interface for connecting a processing unit.