JPH01286177A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To detect a write error in writing data and to perform an error evading processing appropriately by checking the cycle of modulated write data at the time of writing data on a disk medium. CONSTITUTION:When the data is written on the disk medium, the write data sent from a host device is sent out to a read/write circuit part 2 via a control part 4. Next, a various kinds of modulation are applied on the data, and it is written on the disk medium. At this time, the write data modulated simultaneously is also sent to a write cycle check circuit 3, and the cycle of the modulated write data is checked. When abnormality exists in the cycle of the write data, it is reported to the control part 4 as the write error. And the control part 4 interrupts a write operation, and transmits a reported write error to the host device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device that can detect write errors during data convolution on a disk medium.

(Prior Art) Conventionally, in this type of magnetic disk drive, when writing data to a disk medium, the cycle of modulated write data was not checked in order to write data to the disk medium.

(Problem to be Solved by the Invention) In the above-mentioned existing magnetic disk devices, when writing data to a disk medium, the period of modulated write data is not checked in order to write one data to the disk medium. borrowed. Therefore, even if the write data is modulated incorrectly, the error cannot be detected during writing, and the error is detected only after reading the data. Therefore, even if an error is detected, it is not known at what point in time the error occurred, and the data can hardly be recovered.

SUMMARY OF THE INVENTION An object of the present invention is to have a head and a head positioning means built into a head disk assembly so that data can be written to/read from a disk medium set in the head disk assembly, and a writing/reading circuit section is provided with a head and a head positioning means. It is an object of the present invention to provide a magnetic disk medium configured to eliminate the above-mentioned drawbacks and easily recover from errors by checking the modulation period of the output complimentary data and controlling data processing according to the check output.
be.

(Means for solving the problem of line layers) A magnetic disk device according to the present invention includes a head disk assembly, a write/read circuit section, a write cycle check circuit section, and a control section.

The head disk assembly includes a head and head positioning means, and is used to record/reproduce information on a disk medium.

The write/read circuit section is for writing/reading data to/from a disk medium set in the head disk assembly.

The write cycle check circuit section is for checking the modulation cycle of write data output from the write/read circuit section.

The control section is for controlling processing according to the output of the write cycle check circuit section.

(Example) Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the main parts of an embodiment of a magnetic disk device according to the present invention.

As shown in FIG. 1, this embodiment includes a head disk assembly 1, and the head disk assembly 1 includes a write/read circuit section 2 for writing/reading data to/from a disk medium, and a write/read circuit section 2 for writing/reading data to/from a disk medium. Write cycle check circuit section 3 for checking the modulation cycle
and a control section 4 are built in.

In the magnetic disk device shown in FIG. . The data is then subjected to various modulations and written to the disk medium in order to be convolved onto the disk medium. At this time, the convolution data modulated at the same time is also sent to the write cycle check circuit section 3,
The period of the modulated write data is checked. If the cycle of the write data is abnormal, it is reported to the control unit 4 as a write error. Upon receiving the report, the control unit 4 stops the write operation and reports the reported write error to the host device. This makes it possible to immediately take appropriate error avoidance measures.

(Effects of the Invention) As described in detail above, the present invention, especially when writing data to a disk medium, eliminates convolution errors by checking the cycle of write data modulated for writing to the disk medium. This has the effect that it can be detected during writing and appropriate error avoidance processing can be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a magnetic disk device according to the present invention. 1...Head disk assembly 2...Write/read circuit section 3...Write cycle check circuit section 4--Control section Patent applicant Hisashi Inoro, patent attorney representing NEC Corporation

Claims (1)

[Claims] a head disk assembly that includes a built-in head and head positioning means for recording/reproducing information on a disk medium; and a writing device for writing/reading data to/from the disk medium set in the head disk assembly. /Reading circuit section and the above writing/
A write cycle check circuit unit for checking the modulation cycle of write data output from the read circuit unit, and a control unit for controlling processing according to the output of the write cycle check circuit unit. A magnetic disk device characterized by: