JPH06103710A - Disk storage device - Google Patents

Abstract

PURPOSE:To allow a high speed data writing to be compatible with the guarantee of reliability in the writing data. CONSTITUTION:When a data block A on a track 107 comes to the position of a head 102 only for writing rise, the writing data previously stored in a comparator circuit 106 are written into the data clock A by the head 102 only for writing through a writing circuit 104. These data are read out almost at the same time by the head 103 only for reading rise, since they are moved under the head 103 only for reading by the rotation of the disk. The writing data and reading data are compared by the comparator circuit 106 to which the reading data are transferred, and of an error is present on the reading data, the re-writing to the data block A wherein the error on the disk 101 is present, is requested to the writing circuit 104, then the data are corrected, when the disk 101 is rotated once and the data block A comes again to the position of the head 102 only for writing.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a disk storage device.

[0002]

2. Description of the Related Art FIG. 2 is a plan view of an example of a conventional disk storage device. In FIG. 2, writing or reading is performed when the writing / reading head 202 passes over the track 203 of the disk 201. As described above, in the conventional disk storage device, the same head is used for both writing and reading data, for example, the track 20.
When data is written by the head 202, the data block B on 3 cannot be read because the disk 201 does not come under the head 202 until the disk 201 has rotated at least once.

[0003]

In this conventional disk storage device, since writing and reading of data are performed by the same head, the written data cannot be read without waiting for rotation. In addition, when writing a large amount of data such as a cylinder change or a track change, to read the data, the writing is completed or stopped halfway, so the reading is equivalent to the writing time. Takes time to read. Therefore, of course, whether or not an error occurred during writing was not checked, but correction was not done because the processing speed slowed down. Trying to secure
There was a drawback that the processing speed had to be slowed down.

[0004]

DISCLOSURE OF THE INVENTION A disk storage device of the present invention comprises at least one set of write-only heads and read-only heads arranged on the same track of a disk medium, said array comprising data blocks on said tracks. Are adjacent to each other in the order of passing under the read-only head and then passing under the read-only head.

A write circuit for sending write data for writing to the data block on the track to the write-only head, and a read circuit for reading data from the data block via the read-only head,
The read data from the read circuit may be compared with the write data, and if the write data does not match, a comparison circuit may be provided to request the write circuit to rewrite the write data.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a disk storage device of the present invention.

In the embodiment shown in FIG. 1, the disk 101
A set of write-only head 102 and read-only head 103 are arranged adjacent to each other on the track 107 of
When the disk 101 rotates in the direction indicated by the arrow, the write-only head 102 first writes the data from the write circuit 104, and then the read-only head 103 reads the written data and the read circuit 10 is read.
It is in the order of sending to 5.

Next, the operation of this embodiment will be described.
When the data block A on the track 107 reaches the position of the write-only head 102, the comparison circuit 10
The write data stored in 6 is the write circuit 104.
The data block A is written by the write-only head 102 via. The data written in the data block A moves below the read-only head 103 due to the rotation of the disk 101, and is read by the read-only head 103 almost at the same time. This read data is transferred to the comparison circuit 106. The comparison circuit 106 compares these two write data with the read data, and if there is an error in the read data, the write circuit 104 writes the disc 1
Data is corrected when the disk 101 makes one revolution and the data block A comes to the position of the write-only head 102 again by requesting rewriting to the data block A having an error on 01.

It goes without saying that there may be a plurality of sets of write-only heads and read-only heads.

[0010]

As described above, according to the present invention, an error at the time of writing data can be checked almost at the same time as the writing of data. Therefore, the redundant time for error checking according to the prior art can be omitted. The effect that both high-speed data writing and reliability guarantee of written data can be achieved is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a disk storage device of the present invention.

FIG. 2 is a plan view of an example of a conventional disk storage device.

[Explanation of symbols]

 101, 201 disk 102 write-only head 103 read-only head 104 write circuit 105 read circuit 106 comparison circuit 107, 203 track 202 head A, B data block

Claims (2)

[Claims] 1. A disk medium comprising at least one set of write-only heads and read-only heads arranged on the same track, said array being provided after a data block on said track has passed under said write-only head. A disk storage device characterized in that they are adjacent to each other in the order of passing under a read-only head. 2. A write circuit for sending write data for writing to a data block on the track to the write-only head, a read circuit for reading data from the data block via the read-only head, and the read circuit. 2. The disk storage device according to claim 1, further comprising: a comparison circuit that requests the write circuit to rewrite the write data when the read data and the write data are not matched.