JPH0562373A - Check instrument for optical disk id part - Google Patents

Abstract

PURPOSE:To specify an ID part, where error occurs, with an economical constitution by adding an error check part to the optical disk driver of an arbitrary practical machine. CONSTITUTION:When an error check part 3 is added to an optical disk driver 2 and an optical disk to be checked is set and rotated, a serial ID signal is inputted to an ID decoder 31. This ID signal is successively decoded by a decoder 31 and is transferred to an ID register 32 and is stored as parallel data. Simultaneously, ID discrimination bits are inputted to a CRC computing element 36 to generate CRC data, and this data is sent to a CRC comparator 37. The comparator 37 compares CRC data of the ID data stored in the register 32 with CRC data generated by the computing element 36. Since OK information is not outputted if they do not coincide with each other, a data memory 35 is checked to discriminate and specify the ID part, where error occurs, by the address where OK information is not stored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device for checking an ID section error in an optical disk or magneto-optical disk evaluation test.

[0002]

2. Description of the Related Art Optical disks or magneto-optical disks have enormous storage capacities and are being put to practical use as recording media for consumer appliances and information processing apparatuses. In FIG. 2 (a), 1 denotes an optical disc or a magneto-optical disk used in the information processing apparatus (described as below optical disk), track T _R is provided with a very small pitch in the radial direction, each T _R Is divided into sectors [Sec01 to SecN] in the circumferential direction starting from the index (INDX). The number of T _R and Sec depends on the size of the disk, but T _R is 10,000 or more, the total number of Sec is more than 300,000, and the storage capacity reaches several hundred megabytes.

[0003] Each Sec optical disc similarly ID (self-identification) and various magnetic media portion is provided, ID portion is set for ID information, such as this needs to access the data T _R number or Sec Number It However, in optical discs, the probability of error occurrence is rather high due to the small memory unit, so that three identical ID sections are set consecutively, and it is possible to disable sectors due to ID information errors. The method to avoid is standardized. FIG. 2 (b) is an expanded version of each Sec (however, the expansion of Sec01 in the figure is the same for each Sec), and three ID parts of ID ₁ , ID ₂ , and ID _{3 having} almost the same contents are provided. The data section (DATA) follows. FIG. 2 (c) obtained by further expand each ID portion, ID ₁ indicates the address of the T _R AD, Sec indicating the address of the T _R SecAD, ID ₁
An identification bit and a CRC (Cyclic Redundancy Check) code for checking errors for all of them are added and configured. The same applies to ID ₂ and ID ₃ , but the ID identification bit is set for each.

The optical disc is inspected by the inspection device when Sec is set for each T _R , and each ID section is C
An error is checked by the RC code, and also when the data is accessed by mounting this on a practical optical disk driver, the error check of the ID part is also performed. FIG. 3 shows a method of judging the quality of each ID part by checking the CRC code. When Sec is set, the ID
_If any _{two of 1} , ₁ , ID ₂ , and ID ₃ are correct, the Sec is OK. In actual use, if any one of them is correct, it is determined to be OK.

[0005]

In the above-described inspection of the ID section, it is possible to inspect the error of the ID section to some extent by using a practical optical disk driver as an inspection device. However, the data access to the optical disk is fixedly controlled by an interface called SCSI (SCSI), and the above-mentioned inspection of the unique ID part of the optical disk is not always complete and sufficient. That is, as shown in FIG. 3, when one ID part is correct, it is judged as OK, so whether or not there is an error in any one or two other ID parts, or there is no error in the correct ID. Part and the ID part where the error occurred are unknown. Therefore, there is a drawback that the check data cannot be obtained for each ID part and the evaluation cannot be completed completely. On the other hand, in order to perform an error check on each ID section, a method is generally used in which correct ID data is stored in the memory of the inspection device and bit comparison is performed between this and the read ID data. According to this method, the error bit of the ID data can be specified, but the ID data is not always constant depending on the manufacturer of the optical disc, and it is often difficult to obtain correct ID data in advance. On the other hand, in order to evaluate the quality of the ID part, the ID in which the error occurred
Since it is only necessary to specify the part, the above method of specifying even the error bit is rather a roundabout. Therefore, a simple method for identifying the ID part in which an error has occurred is desirable. in this case,
If a practical optical disk driver is used as the driver of the inspection device, the device can be constructed at low cost. The present invention has been made in view of the above, and an error check unit is added to an optical disk driver of an arbitrary practical machine,
It is an object of the present invention to provide an inspection device for identifying an ID section in which an error has occurred.

[0006]

SUMMARY OF THE INVENTION The present invention is an optical disk ID portion inspection apparatus that achieves the above object, and is configured by adding an error check to an arbitrary optical disk driver. The error check unit is an ID consisting of three ID units ID ₁ , ID ₂ and ID ₃ output by the driver.
ID decoder for decoding signals, ID register for sequentially storing each ID data of each decoded ID section, and each ID
Data track address, sector address and ID
A CRC calculator that creates CRC data for the identification bits, compares each created CRC data with the CRC code of each ID data stored in the ID register, and generates OK information when both match, CRC comparison A container and an ID check data memory that stores OK information at an address corresponding to the ID data are mainly configured.

[0007]

In the above inspection apparatus, the ID signal output from the driver by the rotation of the optical disk is input to the ID decoder and sequentially decoded, and when each ID data is prepared, it is stored in the ID register for each ID data. It is transferred and stored. At the same time, the track address, sector address and ID identification bit of each ID data are transferred to the CRC calculator to create CRC data for them. Created CRC data and I stored in the ID register
The CRC code of the D data is compared by the CRC comparator, and when they match, OK information is output. In the above, the CRC is used for convenience to avoid confusion.
Although different expressions are used for "code" and CRC "data", the essence is the same. O output by the above
The K information is stored in the address of the ID check data memory corresponding to the ID data. After the measurement is completed, the ID check data memory is inspected, and the address where the OK information is not stored makes it possible to identify and identify which of ID ₁ , ID ₂ and ID ₃ the error has occurred. In the above, it is not necessary to know the bit configuration of the ID data in advance, the ID part in which the error has occurred is specified, and it is not necessary to provide a special driver in the inspection device as an optical disk driver. The inspection device is economically constructed by using any one.

[0008]

1 is a schematic block diagram of an inspection apparatus according to an embodiment of the present invention. In the figure, reference numeral 2 denotes an optical disk driver of each manufacturer on the market, to which an error check unit 3 is added. The error check unit is an ID decoder 31 connected to the ID signal terminal of the driver 2, followed by an ID register 32, an address generator 33, a memory control unit 34, an ID check data memory 35, a CRC calculator 36, and a CRC. It has a comparator 37, and is further provided with a timing control unit 38 which is connected to the timing signal terminal of the driver and supplies a control timing signal to each necessary unit.

The operation of the error check for the above configuration will be described. When the optical disk to be inspected is mounted on the driver 2 and rotated, a serial ID signal is transmitted to the ID decoder 31.
To enter. On the other hand, the timing signal from the driver is input to the timing control unit 38, and the control timing signal is supplied to each unit. The ID signals input to the ID decoder are sequentially decoded by the control timing signal, and ID ₁ , I
When the ID data of each ID portion of D ₂ and ID ₃ are prepared, they are sequentially transferred to the ID register 32 for each ID data and stored as parallel data. At the same time,
T _R AD for each ID data, SecAD, ID identification bit (see FIG. 2 (c)) is input to the CRC calculator 36, CRC data for these is sent to the CRC comparator 37 is created. On the other hand, I stored in the ID register
The CRC code of the D data is taken into the CRC comparator 37 and compared with the above CRC data. When they match, the CRC comparator outputs an OK information write command to the address generator 33 and the memory controller 34. OK
The address generator receiving the information write command takes in the ID data of the ID register 32, generates the corresponding address of the ID check data memory 35 for this, and stores the OK information in the corresponding address of the data memory 35 by the memory control unit 34. To be done. After the measurement is completed, the data memory 35 is inspected and
The error is I due to the address where K information is not stored.
Which of the ID parts D ₁ , ID ₂ , and ID ₃ has occurred is identified and specified, and the specified ID part is output as an error ID.

[0010]

As described above, in the inspection apparatus according to the present invention, it is not necessary to provide a special driver in the inspection apparatus as an optical disk driver, and any commercially available manufacturer can be used. The added error check section identifies the ID section in which an error has occurred, and the inspection device is economically configured with an optional optical disk driver and a simple error check section. There is a large part that contributes to the evaluation test of.

[Brief description of drawings]

FIG. 1 shows a schematic block configuration diagram of an inspection apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an optical disk or a magneto-optical disk, and track and sector ID portions set in the optical disk.

FIG. 3 is an explanatory diagram of an error check method using a CRC code for an ID section of an optical disc.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk or magneto-optical disk, 2 ... Optical disk driver, 3 ... Error check section, 31 ... ID decoder, 32 ... ID register, 33 ... Address generator, 34 ... Memory control section, 35 ... ID check data memory, 36 ... CRC calculator, 37 ... CRC comparator, 38 ... timing controller, T _R ... track, Sec ... _{sector, ID 1, ID 2, ID} 3
... ID unit, T _R AD ... track address, SecAD ... sector address, CRC ... cyclic redundancy check code.

Claims (1)

[Claims] 1. An inspection device is constructed by adding an error check section to an arbitrary optical disk driver, and decodes an ID signal output from the driver and consisting of three ID sections, ID ₁ , ID ₂ and ID _3. An ID decoder, an ID register for sequentially storing the decoded ID data of each ID section, and a CRC calculator for creating CRC data for the track address, sector address and ID identification bit of each ID data. , The created CRC data is compared with the CRC code of the ID data stored in the ID register, and a CRC comparator that generates match information when both match, and the match information ID
An inspection apparatus for an optical disk ID section, characterized in that the error check section is configured with an ID check data memory for storing the matching information or information corresponding to the address at an address corresponding to data as a main component.