JPH0574065A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To detect and correct a mis-correction since a conventional magnetic disk device executes the mis-correction of an ECC by one sector unit and the turning to data of a complex pattern causes the generation of mis-correction of an ECC correction. CONSTITUTION:A host device and a disk medium 50 are connected through a data buffer 20 having capacity of one track and a second ECC control part 40. To the data buffer 20, a first ECC control part 30 performing an ECC process by one track unit is connected. Since the ECC process for every one track is performed in addition to the conventional ECC process for every one sector, the mis-correction of one sector unit is detected and corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device having improved data reliability.

[0002]

2. Description of the Related Art Conventionally, in this type of magnetic disk device, access to the disk medium is performed in units of one sector, and accordingly, ECC check and correction are also performed in units of one sector.

[0003]

In the above-described conventional magnetic disk device, ECC miscorrection is caused by the garbled data of a complicated pattern which occurs with the increase in recording density due to the recent dramatic increase in disk device capacity. There is a defect that it occurs and a defect that there is no way to detect the error correction.

[0004]

The magnetic disk device of the present invention has a data buffer for one track in the magnetic disk device, and when writing to the disk, the data up to the last sector of the track of the magnetic disk device 1 is written. Error correction code (hereinafter referred to as “ECC”) data is generated in the area of the last sector and written collectively for one track. When reading from the disc, one track is read collectively, and E for the data up to the last sector is written.
After being checked and corrected by CC, it is configured to have a function of sending it to a higher-level device.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to FIG.

FIG. 1 is a block diagram showing the configuration of an embodiment of a magnetic disk device according to the present invention. In FIG. 1, the host device and the disk medium 50 are connected to each other via the data buffer 20 and the second ECC control unit 40, and the data buffer 20 is connected to the first ECC control unit 30.

The magnetic disk drive 1 thus constructed
The operation of 0 is as follows.

In the case of the read operation, first, all the sectors of the track in which the sector instructed to be read by the host device exists are read into the data buffer 20. At this time, the second ECC control unit 40 does not
Check and correct. As described in the description of the write operation, the data of the last sector contains ECC data of the data up to the last sector, so the data buffer 2
After checking and correcting the data in 0 by the ECC data of the last sector, the data of the designated sector is transferred to the upper device.

In the case of the write operation, first, all sectors of the track in which the sector instructed to be written by the host device exists are read into the data buffer 20 in the same manner as the above-described read operation. After that, the data sent from the host is overwritten on the corresponding sector of the data buffer 20, and the first ECC control unit 30 creates ECC data for the data up to the last sector in the area of the last sector. Write the data on the disk medium 50. At this time, the ECC data is added to each sector by the second ECC control unit 40 as in the conventional case.

[0010]

As described above, the present invention is one of the conventional methods.
In addition to the ECC check for each sector, it has the ECC check and correction function for the data up to the last sector by using the area of the last sector for each track. Therefore, it is necessary to detect and correct the error correction in the conventional ECC. There is an effect that can be done.

[Brief description of drawings]

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

[Explanation of symbols]

 10 magnetic disk device 20 data buffer 30 first ECC control unit 40 second ECC control unit 50 disk medium

Claims (1)

[Claims] 1. A magnetic disk device having a data buffer for one track, and at the time of writing to the disk, an error correction code (hereinafter referred to as "ECC") data for data up to the last sector of a track of the magnetic disk device 1 is written. A function to generate in the area of the last sector and write one track at a time, read one track at a time when reading from the disk, check and correct the data up to the last sector by ECC, and then send it to the upper device A magnetic disk device comprising: