JPH03242875A - Inspection device for disk device - Google Patents

Abstract

PURPOSE:To easily detect error generation distribution by securing the address area of each storage part so as to be large, and storing altogether even a read error generated continuously or generated by plural pieces at a time. CONSTITUTION:A data position counter 6 inputs a byte pulse (b) as a clock, and outputs always its position as a count value while synchronizing with read data (a) to be always inputted. Since an error signal pulse (d) from a comparing part 3 is inputted to a second counter 5 as the clock, and simultaneously, it is inputted to an error position storage part 7 as a latch signal, the error position storage part 7 comes to store the position of error data at that time in an address corresponding to prescribed error counting sequence. Accordingly, a data processing part 8 can inspect a disk device by using data stored in a data storage part 4 and the error position storage part 7. Thus, the analysis of the read error becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inspection device for inspecting a magnetic disk device.

[Prior Art] Conventionally, this type of inspection apparatus has only included a data latch circuit for one piece of information and a display section. The data latch circuit holds the read data and the occurrence position at the time when the read error is detected, and the display section displays the data held by the data latch circuit.

[Problem to be solved by the invention]

The conventional disk inspection device described above only holds read error data for one piece of information, so if read errors occur consecutively or multiple times, the data held by the data latch circuit will erase the previous data and replace it with the read error data that occurred last. This becomes error data, and the previous read error data cannot be read. Therefore, there is a drawback that the distribution of occurrence of read errors cannot be recognized.

Further, since this conventional device cannot retain data before and after the read error occurs, it is not possible to know the correlation between the data content of the read error and the data before and after the read error. Therefore, there is a drawback that accurate read error information to know the cause of read error occurrence is insufficient.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, retain data within a certain range, and analyze read errors.
The purpose of the present invention is to provide an inspection device that enables the following.

[Means to solve the problem]

The inspection device of the present invention includes a data position counter that sequentially counts byte pulses generated in synchronization with read data of a disk device to be inspected in a certain range, and outputs a count value as data position information of the range, and a byte A data storage section that inputs a pulse as an address update pulse and stores the read data in the range at a predetermined address, and a write data reproduction section that inputs a byte pulse and reproduces pre-stored data for each input. a comparison section that compares the read data with the reproduction data of the write data reproduction section and generates an error signal pulse when there is an error in the read data; and a comparison section that counts the output of the comparison section and calculates the counted value. It is configured to include an error position storage section that latches and stores the output of the data position counter every time an error signal pulse occurs as an address, and the data processing section performs data processing for testing the disk device. can read out the data held in the data storage section and the error position storage section as appropriate.

C Effect J For example, if data for one track is handled as a fixed range, even if there are multiple pieces of error data that occur within this track, all error position information can be read out from the error position storage section, and The error data at that time can be known from the data storage section. Furthermore, since the read data is stored for one track, it is also possible to know the read data before and after the error position.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of one embodiment, and FIGS. 2 and 3 are timing waveform diagrams of signals in each part. In the figure,
4 is a data storage section, 7 is an error position storage section, and this data storage section 4. Read data from error position storage section 7,
Data processing section 8 performs data processing.

As for the read data a, as shown in FIGS. 2 and 3, 8 bits are treated as one data, and a byte pulse b is input to this inspection device for every 8 bits. In this example,
(2) Set a track's worth of transferred data as a predetermined inspection range. Therefore, the data position information is also determined within this range, and the data stored in the data storage section 4 is also determined to be within this range. Therefore, the data storage section 4 and the write data reproducing section 2, which will be described later. The data position counter 6 is cleared by a clear signal C every track. This clear signal C is generated when the byte pulse b is input to the first counter 1 and counted by n pieces (the number of transferred data for one track) as shown in FIGS. 1 and 3.

The read data a is input and stored in the data storage section 4, and the address at this time is stored at a predetermined address by inputting the byte pulse b as an address update pulse. Then, every time the byte pulse b is input to the write data reproducing section 2, the correct write data stored in advance is reproduced and output. In the write data reproducing section 2, write data is arranged and recorded for each track, and each time a clear signal C is received, the write data changes, and the write data is reproduced and output from the beginning position of the track. . The read data a and the output data of the write data reproducing section 2 are data at corresponding positions (see FIG. 2). Then, both data are compared by the comparator 3, and if the two outputs are different (that is, there is an error in the read data), a logic high signal is generated.

This logic high error signal pulse d is measured by the second counter 5, and the count output (...j, j+1°...
) is sent to the data processing unit 8 and also sent as an address input to the error position storage unit 7.

On the other hand, the data position counter 6 inputs the byte pulse b as a clock and outputs the position as a count value in synchronization with the input read data a. Comparison part 3
Since the error signal pulse d is inputted to the second counter 5 as a clock and also inputted to the error position storage unit 7 as a latch signal, the error position storage unit 7 stores the position of the error data at that time in a predetermined manner. It will be stored at an address corresponding to the error counting order.

As described above, all positional information of error data is stored in the error position storage section 7, and read data is stored in the data storage section 4 according to all data positions. Therefore, the data processing unit 8 can inspect the disk device using the data stored in the data storage unit 4° error position storage unit 7.

[Advantageous Effects of the Invention 1] As explained above, the present invention secures a large address area for each storage section and stores all read errors that occur consecutively or in multiple numbers, so that the error occurrence distribution can be easily detected. Furthermore, by displaying the data on the data processing section, it is possible to read all the error data and error occurrence positions at a glance.

Further, it is also possible to recognize the data of the preceding and following bytes from the data contents of the storage section and find out the correlation with the word error data. Since read data and error position data are held in each storage section, accurate information can be obtained at any time for quality control purposes.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram of an embodiment of the present invention, FIG.
FIG. 3 is a timing waveform diagram of each part of the embodiment. ■...First counter, 2...Write data reproducing section, 3...Comparing section, 4...Data storage section, 5.
...Second counter, 6.Data position counter, 7.Error position storage section, 8.Data processing section, a..Read data, b.
...Bite pulse, C...Clear signal, d...
・Error signal pulse.

Claims (1)

[Claims] A data position counter that sequentially counts the byte pulses that occur in synchronization with the read data of the disk device under test in a certain range and outputs them as data position information for the range, and inputs the byte pulses as address update pulses. a data storage section that stores the read data in the range at a predetermined address; a write data reproducing section that inputs byte pulses and reproduces pre-stored data for each input; A comparison section that compares the reproduced data of the data reproduction section and generates an error signal pulse when there is an error in the read data, and a comparison section that counts the output of the comparison section and uses the counted value as an address to control the data position counter. and an error position storage section that latches and stores the output every time an error signal pulse occurs, and reads out the data held in the data storage section and the error position storage section as appropriate for inspection of the disk device. An inspection device for a disk device, comprising a data processing section that performs data processing.