JPH0844586A - File evaluation device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to evaluate the electrical system circuit even before the mechanical part of the file device and the entire configuration are manufactured, and it is not necessary to create an evaluation board for each function, and various patterns are available. The purpose of the present invention is to provide a file evaluation device that attaches importance to versatility so that the write data can be evaluated easily. In a file evaluation device used for evaluation and inspection of reading and writing of a file device for recording information on a recording medium by magnetic or optical, generating means for generating servo data and ID / address code which are control signals of the recording medium. 1, a storage unit 2 for storing the write data to the recording medium, and a transmission unit 3 for transmitting the control signal generated by the generation unit 1 and the write data stored in the storage unit 2 to the file device. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file evaluation device used for evaluating and inspecting reading and writing in a file device for recording information on a recording medium by magnetism or light.

[0002]

2. Description of the Related Art In a file device for recording / reproducing information on / from a recording medium by magnetism or light, a file evaluation device is used for read / write evaluation and inspection. If so, after storing the worst pattern data with a high probability of error occurrence in the ROM of the file evaluation device, etc., after actually writing this from the ROM to the recording medium of the file device, Read the written data and use the RO
By comparing with the stored contents in M, it was confirmed whether each circuit means is operating correctly. Further, a method of examining the tracking characteristic by inputting a single frequency to the PLL circuit has been adopted.

However, with this method, in order to read / write information from / to an actual recording medium, the evaluation could not be performed until the mechanical section of the file device and the overall configuration were completed. Moreover, in order to evaluate each function of the file device, it was necessary to create an evaluation board for each. Further, in the evaluation of the data of the pattern having the fixed contents written in the ROM or the like, there is a problem that the evaluation contents are fixed and lack versatility.

[0004]

In the above-mentioned conventional technique, since the information is read from and written to the actual recording medium for evaluation, the evaluation cannot be performed until the mechanical portion and the entire structure of the file device are completed. . Moreover, in order to evaluate each function of the file device, it was necessary to create an evaluation board for each. Further, in the evaluation of data of a fixed pattern written in a ROM or the like, there is a problem that the evaluation content is fixed and lacks versatility.

[0005]

SUMMARY OF THE INVENTION Therefore, according to the present invention, it is possible to evaluate an electric system circuit even before manufacturing the mechanical portion of the file device and the entire structure, and it is not necessary to prepare an evaluation board for each function.
Moreover, it is an object of the present invention to provide a file evaluation device that attaches importance to versatility so that evaluation of write data of various patterns can be easily performed.

[0006]

In order to achieve the above object, the present invention provides evaluation and inspection of writing and reading functions for a file device that records and reproduces information on a recording medium by magnetism or light. In the file evaluation apparatus for performing, a generation means for generating servo data and an ID / address code which are control signals for the recording medium, a storage means for storing write data to the recording medium, and a control generated by the generation means A signal and transmission means for transmitting the write data stored in the storage means to the file device; a configuration in which the frequency of the basic clock transmitted from the transmission means to the file device is variable; A delay means having a variable delay time is provided between the means and the file device, and the write data stored in the storage means is stored. Characterized in that a replacement means for replacing the write data.

[0007]

The file evaluation device configured as described above is
It has generation means for generating servo data and ID / address code, storage means for storing write data, and transmission means for transmitting control signals generated by the generation means and write data in the storage means to a file device. Therefore, if the file device creates the position information that the file device wants to write by the generation means and sends it to the file device through the transmission means, the same action as when the write position is found occurs on the file device side, and as a result, the file device writes the data that it wants to write. It can be transmitted and stored in the storage means of the file evaluation device. Further, in order to read the data written in the storage means, the generation means generates information on the read position,
Send back from the transmission means together with the written data,
It is possible to judge whether or not the file device is operating normally by causing the file device side to determine the read position and reading the data, and comparing the data with the written data. Further, since the variable timing control means is provided so that the frequency of the basic clock of the signal sent through the transmission means of the file evaluation device can be changed variously, the frequency tracking characteristic of the file device can be easily evaluated. Furthermore, since the signal sent from the file evaluation device has a delay means that can delay any time, the time margin of each function of the file device can be easily evaluated,
It is an object of the present invention to provide a file evaluation device that attaches importance to versatility in that it is possible to easily evaluate the error detection function and the correction capability of each part because a replacement means for replacing write data with another data is provided.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. In FIG. 1, a basic operation of reading and writing will be described focusing on a hard disk as an example of the file device. First, the write procedure will be described. The write data and the write position information sent from the host device 21 such as a personal computer are written via the SCSI interface 15 of the file device 10 (indicated by a chain line). It is sent to the information creating means 14. In the writing information creating means 14,
The write data sent from the host device 21 is compressed in a high-density write conversion method, for example, the RLL (Run Length Limited) method, which is widely used at present, in the form of 2-7 conversion, and E for error correction is compressed.
A CC code and a SYNC code for creating a synchronization timing at the time of reading (see FIG. 4) are added to prepare for writing.

On the other hand, the data recorded on the recording medium 11 for searching for the writing position is detected as a current change by the electromagnetic conversion means 12 which is normally in the read state, and sent to the read means 16 to be arranged into a data pulse train. To be The data pulse train is sent to the position detecting means 17, only the position information is read and sent to the write information creating means 14. The write information creating means 14 compares the information on the write position sent from the host device 21 with the position information sent from the position detecting means 17, and writes the coincident position instantly as the write position. The data is sent to the writing means 13. The writing unit 13 replaces information with a change in current corresponding to the pulse train of the write data that has been sent, and records the information at a position to be written on the recording medium 11 by the operation of the electromagnetic conversion unit 12.

Next, the procedure for reading the data recorded on the recording medium 11 such as a magnetic disk or an optical disk will be described. The position information to be read on the recording medium 11 from the host device 21 is written via the SCSI interface 15. It is sent to the information creating means 14. On the other hand, the data recorded on the recording medium 11 is detected by the electromagnetic conversion means 12 as a current change and sent to the reading means 16 to prepare a data pulse train, and the data pulse train is detected by the position detection means 1.
7 and the current position information is sequentially written into the information writing means 14
It is the same as the above-mentioned writing procedure until it is notified to.

When the write information creating means 14 determines the position information to be read, the PLL (Phase Lock)
A synchronization timing is created so that the phase synchronization means 18 such as d Loop) can read the data without fail.
Further, the read information creating means 19 is the position detecting means 1 described above.
The data of the target position is definitely read by the information from 7 and the synchronization timing from the phase synchronization means 18,
In addition, 2-7 performed by the writing information creating means 14 at the time of writing
The conversion is converted back and returned to the host device 21 via the SCSI interface 15. At this time, when an error is found in the read data, the error is corrected based on the ECC code added for error correction. The host device 21 side can know whether the target file device is operating normally by checking whether the data received from the read information creating means 19 is the same as the data sent at the time of writing. However, when an error occurs on the host device 21 side, part of the functional part of the file device is not completed, or when you want to change the conditions of part of the function, you can not evaluate further than that. there were.

FIG. 2 shows a situation in which the file device 10 is evaluated by the file evaluation device 9 of the present invention. The part surrounded by the dotted line is the file evaluation device 9, and the part indicated by the alternate long and short dash line is obtained by removing a part of the functional part of the file device 10. A part of the removed functional unit is the recording medium 11, the electromagnetic conversion unit 12, the writing unit 13, and the reading unit 16, which can be understood by comparing FIGS. 1 and 2. As the evaluation operation, the data pattern to be tested and the information on the write position are transmitted from the host device 21 to the SCSI of the file device 10.
Send to interface 15. On the other hand, the servo data and ID of the writing destination from the generating means 1 of the file evaluation device 9
An address code is generated and sent to the position detecting means 17 through the transmitting means 3. In the writing information creating means 14,
Information on the write position received from the host device 21 via the SCSI interface 15 and the position detecting means 1
If the information of the position received from 7 matches, the data pattern to be tested is stored in the storage means 2 of the file evaluation device 9.
Send to. However, instead of the data pattern as it is, the data is compressed by the conversion method capable of writing at high density as described above, and the SYNC code for synchronizing timing at the time of reading, the address code for recognizing the start of the data, and An ECC code for error correction is added (see FIG. 4) and sent, and stored in the storage means 2.

Next, when a command for reading the data pattern is sent from the host device 21, the servo data of the position information and the ID.
Data of the address part such as an address code is generated and sent to the file device 10 through the transmitting means 3. on the other hand,
The data of the data section is the SYNC code, the address code, the data pattern of the test, and the ECC code stored in the storage means 2 in synchronization with the timing from the generating means 1, and the file means through the transmitting means 3 in the same manner as the address portion data. Send to 10. In the writing information creating means 14,
Read position information received from the host device 21,
If the information on the position of the generating means 1 received via the position detecting means 17 is the same, the data of the data portion is read by the read information creating means 19. As a matter of course, when reading the data, the phase synchronization means 18 uses the SYNC of the data section.
Create sync timing for reading from code,
I am trying to read the data at the correct time intervals. Further, the read information creating means 19 reads the data at the target position, performs the inverse conversion of the 2-7 conversion performed at the time of writing, and returns the data to the host device 21 via the SCSI interface 15. When an error is found in the data, it is sent after correcting it based on the ECC code. In the host device 21, it is possible to determine whether or not the file device 10 is operating correctly by comparing the sent data pattern with the received data pattern. Therefore, if the configuration is as shown in FIG. 2, the test data pattern may be any pattern, and generally can be easily changed by the host device 21. Further, according to the present invention, the electric system circuit can be evaluated even before the mechanical portion of the file device 10 and the entire structure are manufactured, and at least two signal lines are drawn out from the file device 10, so that the completed product can be obtained. It can also be used for inspection.

FIG. 3 is a circuit diagram of an embodiment in which some functions are added to the above-mentioned file evaluation device 9 so that more detailed evaluation can be performed. The generation means 1, the storage means 2 and the transmission means 3 are shown in FIG. The basic operation is the same. The delay means 4 is for providing a delay time between the transmitting means 3 and the file device 10 to be evaluated, and the delay time can be freely changed. Therefore, by operating the delay means 4 during the evaluation, the following evaluation can be performed. That is, the group delay of the reading operation: the delay amount is changed from the middle of the signal train for each group. Peak shift: A different delay amount is given to each adjacent bit. Function operation margin: Delays signals such as servo data, ID / address code, SYNC code, data, and ECC code during transmission. In this way, various signals are lacking various delays, and by observing the normal operation, it is possible to check the margin amount for normal operation for each function.

Further, the replacing means 5 is provided to replace the write data stored in the storage means 2, and can replace a part or all of the write data. . Therefore, if a part or all of the writing data is sent by the replacing means 5 when the writing data is sent from the file evaluation device 9 described in FIG. 2, an error occurs at the time of matching with the ECC code, and the correction by the ECC code is performed. You can evaluate how well you can use it.

In FIG. 3, the variable timing control means 6 includes servo data, ID / address code, SYNC code,
It is configured so that the frequency (pulse interval) of the basic clock for sending signals such as data and ECC code can be changed and sent. That is, the transmission interval of the write data stored in the storage means 2 and the transmission interval of the signal generated by the generation means 1 can be freely changed. Therefore, this is a motor for driving the recording medium 1 of FIG. The same effect as in the case where the rotational fluctuation component (not shown) is pseudo-applied. As a result, it is possible to easily evaluate the frequency tracking characteristic of the phase synchronization means 18 such as the PLL. In addition, it is possible to check the operation margin of each function with respect to frequency fluctuation. Further, even in the case where the above two are combined, the effect can be sufficiently exerted.

FIG. 4 shows the outline of one sector format, which has often been mentioned in the above description, and the servo data of the address portion is the position in the radial direction of the recording medium 1 (disc-related). (In the apparatus, it is called a track), and the ID / address code contains a SYNC code for synchronization, a track number, a sector number, an ECC code for error correction, and the like. Further, the SYNC code of the data part is for creating a synchronization timing for reading the data part, and the address mark is for byte synchronization for reading subsequent data. In the case of the RLL method, It is a specific pattern starting with 1. The data section is where the data to be written enters, and the ECC code is for correcting an error due to a defect in the data section. Also,
When writing data, the data scatter between the address part and the data part calls the address part of each sector in order to detect the target address, and when the target write position is found, the operation to write the data part It is for absorbing the rise time. When writing the normal data, if the target write position is found by reading the address section, the entire data section will be rewritten.

With the configuration and operation as described above,
The file evaluation device 9 enables the main evaluation of the electric system circuit even before the fabrication of the mechanical portion and the entire configuration of the file device 10, and it is not necessary to prepare an evaluation board for each evaluation of each function, and moreover, it is decided. It is not necessary to put the written data of the worst pattern that has been written in the ROM or the like, and it is possible to perform versatile evaluation processing for receiving test data of various arbitrary patterns created by the host device 21 such as a personal computer. Furthermore, by changing the frequency variously and transmitting to the file device, transmitting with a time delay, and by intentionally changing the transmission data to the reception data and transmitting, the frequency tracking characteristic and time margin of each function, It is possible to provide a device that easily evaluates the error detection function and the correction capability of each unit.

[0019]

Since the present invention is constructed as described above, the generating means for generating the servo data and the ID / address code, the storing means for storing the write data, and the control for generating by the generating means. By using the transmitting means for transmitting the signal and the write data in the storage means to the file device, the position information desired to be written by the file device is created by the generating means and is sent to the file device through the transmitting means. The same action was taken as the position was found and the same action was taken so that the file device could send the data it wanted to write and store it in the storage means of the file evaluation device. Further, in order to read the data written in the storage means, the generation means generates the information of the read position, the data is sent back together with the written data from the transmission means, and the file device side judges the read position to read the data. By comparing the written data with the written data, it is possible to evaluate whether the file device is operating normally. Further, since the variable timing control means for changing the frequency of the basic clock of the signal sent through the transmission means of the file evaluation device is variously provided, the frequency tracking characteristic of the file device can be easily evaluated. Further, since the signal sent from the file evaluation device is provided with a delay means capable of delaying an arbitrary time, the time margin of each function of the file device can be easily evaluated, and the replacement means for replacing the write data with another data is provided. Therefore, it has become possible to provide a file evaluation device that attaches importance to versatility and easily enables the evaluation of the error detection function and correction capability of each part.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a hard disk device as a typical example of a file device.

FIG. 2 is a block diagram of a main part of a hard disk device of a file evaluation device and an evaluated device according to an embodiment of the present invention.

FIG. 3 is a block diagram of a main part of a file evaluation device to which an evaluation function according to an embodiment of the present invention is added.

FIG. 4 is an explanatory diagram illustrating an example of a sector format of a recording medium of a hard disk device.

[Explanation of symbols]

1 ... Generation means, 2 ... Storage means, 3 ... Transmission means, 4 ... Delay means, 5 ... Replacement means, 6 ... Timing variable control means, 9 ... File evaluation Device, 1
0 ... File device, 11 ... Recording medium, 12 ...
・ Electromagnetic conversion means, 13 ... Writing means, 14 ... Writing information creating means, 15 ... SCSI interface, 1
6 ... reading means, 17 ... position detecting means, 18 ...
.Phase synchronizing means, 19 ... Read information creating means, 21.
-Host device.

Claims (4)

[Claims] 1. A file evaluation device for evaluating and inspecting writing and reading functions in a file device for recording and reproducing information on and from a recording medium by magnetism or light, comprising: servo data which is a control signal for the recording medium. And generating means for generating ID / address code, storage means for storing write data to the recording medium, control signal generated by the generating means, and write data stored in the storage means to a file device. A file evaluation device, comprising: 2. The file evaluation device according to claim 1, wherein the frequency of the basic clock transmitted from the transmission means to the file device is variable. 3. The file evaluation device according to claim 1, further comprising a delay unit having a variable delay time provided between the transmission unit and the file device. 4. The file evaluation device according to claim 1, further comprising replacement means for replacing the write data stored in said storage means with another write data.