JPH033170A - Magnetic disk tester - Google Patents

Abstract

PURPOSE:To execute the temporary generation of a read error in an arbitrary position between tracks by connecting a tester for a data error detecting circuit to a data transfer route between the device of a magnetic disk and magnetic disk controller. CONSTITUTION:At the time of generating the read error in a certain address in a track by using a magnetic disk device 10, position information from an index to generate the read error is written through a signal line 104 to a register 30 beforehand, and when a read action is started by an instruction from a magnetic disk controller 60, a servo signal from the device 10 is given through a servo signal line 102 to a counter 20 and the counting is executed. Next, the addresses in the counter 20 and register 30 are compared by a comparator 40, and when they do not coincide, a gate 50 is opened, and data from the device 10 are transferred through signal lines 101 and 103 to the device 60. When the addresses coincide, namely, when the address to generate the read error reaches the position on the track, the gate 50 is closed by a coincidence signal, and the error is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a testing device for magnetic disks, and more particularly to a testing device for a data error detection port.

BACKGROUND ART Conventionally, when performing this type of test, it has been done by writing data with content that would cause a read error.

Problems to be Solved by the Invention In the conventional testing method described above, it was necessary to write the data that caused the error. The disadvantage is that it was not possible to test records containing specific data.

The present invention has been made in view of the above-mentioned conventional situation,
Accordingly, an object of the present invention is to provide a novel magnetic disk testing apparatus that makes it possible to eliminate the above-mentioned drawbacks inherent in the conventional technology.

Means for Solving the Problems In order to achieve the above object, a magnetic disk testing device according to the present invention includes a counter that counts servo signals from a magnetic disk, and a counter that generates a pseudo read error.
a register for writing address information indicating an arbitrary position from an index within a track; a comparison circuit for comparing the contents of the counter and the register and outputting a match signal when they match; and a match signal output from the comparison circuit. and a gate that temporarily invalidates read data.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

Referring to FIG. 1, if you want to cause a read error to occur at a certain address in the magnetic disk drive 10, the position information from the index where you want to cause the read error is sent in advance from the signal line 104 to the register 3.
Write it as 0. When a read operation starts according to a command from the magnetic disk controller 80, a servo signal from the magnetic disk device 10 is sent to the servo signal line! The counter 20 counts through 02. counter 20 and register 30
The addresses within are compared by the comparator 40, and while they do not match, the gate 50 is open and data from the magnetic disk device 10 is transferred to the magnetic disk controller 80 via signal lines 101 and 103. When the address in the counter 20 and the register 30 match, that is, when the position on the track where you want a read error to occur is reached, the gate 50 is closed by the match signal, and the data from the magnetic disk device IO is transferred to the magnetic disk controller 60. The data will no longer be transferred to , and a read error will occur.

As described in detail, according to the present invention, by connecting the test device according to the present invention to the data transfer path between the magnetic disk device and the magnetic disk control device, read errors can be detected at any position within the track. You can obtain the effect of temporarily generating.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 10...Magnetic disk device, 20...Counter, 3
0...Register, 4G...Comparator, 50...Gate, 60...Magnetic disk control gA device, l Old...Data line, 102...Servo signal line, IO2.
...Data line, 104...Address input line

Claims (1)

[Claims] A counter that counts servo signals from the magnetic disk in the data transfer path between the magnetic disk controller and the magnetic disk device, and a pseudo-generated read error 1
A register into which address information indicating an arbitrary position from an index within a track can be written, a comparison circuit that compares the contents of the counter and the register and outputs a match signal when they match, and a read data A magnetic disk testing device characterized by having a gate for temporarily disabling the magnetic disk.