JPH06195946A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To accurately detect ID date to accurately and quickly position a magnetic head by recording the ID part, which should be read at the time of data write, in a position shifted from the ID part which is recorded on the same line as a data track and should be read at the time of read. CONSTITUTION:The reproduced signal including an ID signal from an ID part 2 read out of a magnetic disk is amplified and is inputted to a data read part and an ID detecting means. A disk control means analyzes the ID detection signal from the ID detecting means and detects arrival of the magnetic head at an objective sector to read the data signal. At the time of write, the reproduced signal including the ID signal from an ID part 1 read out of the magnetic disk is amplified and is inputted to the ID detecting means. The disk control means analyzes the ID detection signal from the ID detecting means and detects arrival of the magnetic head at an objective track to write the data signal on the magnetic disk through a write control means and a magnetic head driving means.

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 suitable for improving the positioning accuracy of a magnetic head.

[0002]

2. Description of the Related Art Conventionally, in a magnetic disk device, an ID section 5 indicating a sector address is provided in order to prevent malfunction.
Is recorded before the data section 4 for recording data. . The ID part 5 is recorded on the same track as the data part 4 without offset as shown in FIG. 3A, or has a certain value Δx as shown in FIG. 3B. It is recorded only offset.

At the time of reading, a reproduction signal including ID data obtained from the magnetic disk by the magnetic head is amplified by the preamplifier and input to the data read section and the ID detecting means. When the disk control means detects from the ID detection signal from the ID detection means that the magnetic head has reached the target sector on the magnetic disk, it controls the data read section to read the data signal.

At the time of writing, a reproduction signal including ID data obtained from the magnetic disk by the magnetic head is amplified by the preamplifier and input to the ID detecting means. When the disk control means detects from the ID detection signal from the ID detection means that the magnetic head has reached a target sector on the magnetic disk, a data signal is written on the magnetic disk via the write control means and the magnetic head drive means. .

In the magnetic disk drive in which the MR composite head and the rotary positioning mechanism are combined, even if the head center line and the track center line are aligned with each other at the center position of the stroke of the rotary positioning mechanism, FIGS. As shown, at both ends of the stroke, a deviation occurs between the two centerlines by an angle θ called a yaw angle. Therefore, M
Since the R composite head has a linear distance of m (= about 10 nm) between the position of the write gap 7 and the position of the read sensor 6, this yaw angle θ causes ΔX
An offset of = m · tan θ occurs between the position of the read sensor 6 and the position of the write gap 7. That is, since an offset of ΔX = m · tan θ occurs at the time of reading and at the time of writing, there is a possibility that the ID part cannot be correctly detected at the time of either reading or writing with one ID part.

Therefore, it has been proposed to perform offset control of the magnetic head based on the read data of the ID section (Japanese Utility Model Publication (U) Hei 3-2472).
There is a problem that the control becomes complicated and the access time becomes long.

[0007]

However, in the above-mentioned conventional example, since there is only one ID part, the ID is located on the magnetic disk at a position where the ID part can be detected at the time of reading.
Even if the ID section is provided, the ID section cannot be detected during writing, and even if the ID section is provided on the magnetic disk at a position where the ID section can be detected during writing, the ID section cannot be detected during reading.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to improve the disadvantages of the prior art, and in particular, in a magnetic disk device using a rotary positioning mechanism and an MR composite head, the ID of the ID section during writing and reading. It is an object of the present invention to provide a magnetic disk device that can detect data accurately and can perform accurate positioning quickly.

[0009]

Therefore, according to the present invention, the magnetization information recorded on the magnetic disk is written to the data portion in which the data of the magnetic disk user is written and the data track center line. It has a first ID portion which is recorded by shifting to a different position for each cylinder so as to correct the gap between the gap and the read sensor, and a second ID portion which is recorded on the same line as the data track. It adopts the configuration of doing. This aims to achieve the above-mentioned object.

[0010]

When reading, the reproduction signal including the ID signal from the second ID section read from the magnetic disk by the magnetic head is amplified by the preamplifier and input to the data read section and the ID detecting means. ID detection means
When the signal is detected, the ID detection signal is output. The disk control means analyzes the ID detection signal from the ID detection means,
When it detects that the magnetic head has reached the target sector on the magnetic disk, it controls the data read section to read the data signal.

At the time of writing, a reproduction signal including the ID signal from the first ID section read from the magnetic disk by the magnetic head is amplified by the preamplifier and input to the ID detecting means. The ID detection means outputs an ID detection signal when detecting the ID signal. Disk control means ID
When the ID detection signal from the detection means is analyzed and it is detected that the magnetic head has reached the target sector on the magnetic disk,
A data signal is written on the magnetic disk via the write control means and the magnetic head drive means.

[0012]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

In the embodiment shown in FIG. 1, the magnetization information recorded on the magnetic disk of the magnetic disk device includes a data section 3 in which various data of the magnetic disk user are written.
The first ID portion 1 is recorded by being shifted to different positions for each cylinder so as to correct the offset between the write gap and the read sensor with respect to the data track center line, and is recorded on the same line as the data track. The second
ID section 2 of

Here, the first ID section 1 is an ID section that is read when writing data, and the second ID section 2 is an ID section that is read when reading data.

The shift amount ΔX from the data track center line in the first ID section 1 can be obtained by the following equation (1).

ΔX = m · tan θ (1)

However, the deviation angle (yaw angle) generated at both ends of the stroke of the rotary positioning mechanism is θ, and the linear distance between the write gap position and the read sensor position is m (= about 10 nm).

Since the yaw angle θ differs from track to track, ΔX also differs from track to track.

For example, the yaw angle of the truck 1 (see FIG.
If (reference) is θ1, the shift amount ΔX1 in track 1 is calculated using the above equation (1). Similarly, if the yaw angle on the track 2 is θ2, the shift amount ΔX2 on the track 2 is calculated using the above formula (1), and if the yaw angle on the track 3 is θ3, the above formula (1) is used. Then, the shift amount ΔX3 in track 3 is calculated.

As described above, the offset amount represented by ΔXn = m · tan θn is obtained in advance in all cylinders from the innermost peripheral portion to the outermost peripheral portion on the magnetic disk, and the first ID portion 1 is Offset by ΔXn.

Next, the operation of this embodiment will be described.

(A). Read operation:

.. The reproduction signal including the ID signal from the second ID section 2 read from the magnetic disk by the magnetic head is amplified by the preamplifier, and the data read section and I
It is input to the D detection means.

[0024]. The ID detection means outputs an ID detection signal when detecting the ID signal.

[0025]. The disk control means analyzes the ID detection signal from the ID detection means, and when detecting that the magnetic head has reached the target sector on the magnetic disk, controls the data read section to read the data signal.

(B). Write operation:

.. A reproduction signal including the ID signal from the first ID section 1 read from the magnetic disk by the magnetic head is amplified by the preamplifier and input to the ID detecting means.

.. The ID detection means outputs an ID detection signal when detecting the ID signal.

.. The disk control means analyzes the ID detection signal from the ID detection means, and when it detects that the magnetic head has reached the target sector on the magnetic disk, it sends a data signal on the magnetic disk via the write control means and the magnetic head drive means. Write.

As described above, by using two types of ID part for reading and for writing, it is possible to prevent erroneous detection or non-detection of the ID part when there is only one ID part.
The ID part is set to I at the time of reading and writing.
The D detection means can accurately detect the maximum output.

[0031]

Since the present invention is constructed and functions as described above, according to this, it is possible to correctly read the ID portion both when writing data and when reading data, and therefore, the magnetic head. It is possible to provide an unprecedented excellent magnetic disk device in which the positioning can be performed quickly and accurately.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram for explaining an offset amount of FIG.

FIG. 3 is a configuration diagram showing a conventional example.

FIG. 4 is an explanatory diagram showing an operation of a conventional example.

[Explanation of symbols]

 1 1st ID part 2 2nd ID part 3 Data part

Claims (1)

[Claims] 1. In a magnetic disk device using a rotary positioning mechanism and an MR composite head, the magnetization information recorded on the magnetic disk is recorded with respect to a data portion in which data is written and a data track center line. A first ID portion recorded by shifting to a different position for each cylinder so as to correct the offset between the write gap and the read sensor and a second ID portion recorded on the same line as the data track are provided. A magnetic disk device comprising: