JPS63263675A - Disk storage device - Google Patents

Abstract

PURPOSE:To read out and write information prevented from the influence of a change in temperature by correcting head positioning in accordance with any combination out of a disk plate, a head driving part, a structural body around a driving part, or atmospheric temperature information. CONSTITUTION:A temperature information signal group 13 for a servo head, a data head and a supporting body mechanism is sent to a positioning correcting circuit 4. The circuit 4 detects temperature distribution from the contents of the temperature information signal group 13, finds out the positional deviation of the head and sends a positioning control signal 12 to a positioning control circuit 3 to control the positioning of the head through a head driving part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device that is an external storage device for an information processing device, and more particularly to a control circuit for a positioning mechanism of a magnetic head of a magnetic disk device.

[Conventional technology]

Conventionally, in a magnetic disk drive, as a means for positioning a data head on a track, crimping position information is recorded, and the data head is positioned from a certain track (servo track).
Data head (servo head) corresponding to this track
A so-called servo control method is used to control the positioning of the data head based on the information read by the controller.

In this method, in order to realize highly accurate positioning, the distance between the tracks is made as small as possible to increase the density of the tracks, thereby increasing the storage capacity. Therefore, in this method, if the relative positional relationship between the servo head and the data head changes, it becomes impossible to write or read information normally.

In magnetic disk drives using this method, temperature differences occur in the various parts that make up the device depending on the operating conditions, and the relative positional relationship between the servo head and data head changes due to the difference in thermal expansion, causing the data to be stored. The head is off the center of the track. It is known that a so-called thermal off-track phenomenon occurs. For example, if a paper output disk device has been stopped for a long time and has become cold, the mW of the servo head, data head support mechanism, disk medium, etc. will not be uniform for a while after startup, and the relative mW of the data head to the servo head will not be uniform. Because the positional relationship changes,
During this time, it becomes difficult to correctly read or write information on the disk medium.

[Problem that the invention seeks to solve]

The above-mentioned conventional magnetic disk drive rIL has the disadvantage that a thermal off-track occurs in which the magnetic head cannot be accurately positioned on the target track due to a change in ambient temperature.

[Ninth way to solve the problem]

The disk storage device IL of the present invention uses a disk plate as an information recording medium, and includes a head that performs mechanical movement for the purpose of reading information from the disk plate, writing information, or both, and a mechanical movement of the head. a positioning control circuit that controls the movement of the head drive unit, temperature information of the disk plate, temperature information of the head drive unit, and structures around the disk plate and the head drive unit. The body i9 is configured to include a positioning correction circuit which inputs all or any combination of the temperature information of the rising air and provides a correction signal to the positioning control circuit.

〔Example〕

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

The figure shows the flow of signals when the head is positioned in the magnetic disk device of the present invention.

The disk medium 1 is composed of several magnetic disk plates, and a servo head and several data heads are attached to the head drive section 2, each of which is assigned a surface of the magnetic disk plate. .

Position information written in advance on the disk medium 1 is read out by the servo head and sent to the positioning control circuit 3 as a position signal 10. The positioning control circuit wr3 generates a positioning control signal lie based on this position signal 10t, and sends it to the head driving section 2 to control the positioning of the head.

At this time, the relative positional relationship between the servo head and the data head may change due to differences in the gA degree distribution of the head drive unit 2, the servo head, and the data head.

Therefore, the temperature of the servo head, the data head, and their support mechanism is converted into a stain signal using a thermocouple or the like and sent as a temperature information group 13 to the positioning correction circuit 4. The positioning correction circuit 4 can know the above-mentioned temperature distribution based on the contents of the 111IIL information group 13, and can know the relative positional relationship between the servo head and the data head, that is, the amount of deviation from the original position of the data head. Positioning correction circuit 4
generates a positioning correction signal 12t based on this information, sends it to the positioning control circuit 3, and controls the data head to be positioned where it should be.

Therefore, the positional deviation of the data head due to temperature changes in the device is corrected, and the thermal off-trail phenomenon does not occur.

〔Effect of the invention〕

As explained in detail above, one disc record of the present inventionffl
Since the thermal off-track phenomenon does not appear in the equipped R,
This has the advantage that information can be written and read without being affected by temperature changes in the device. .

[Brief explanation of the drawing]

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

Claims (1)

[Claims] A disk on which information is recorded, a head that records and reproduces information on the disk, a head drive unit that moves the head in a radial direction of the disk to position it on a target track, and a head drive unit that controls the head drive unit. a positioning control circuit that detects at least two of the temperature of the disk plate, the temperature of the head drive unit, and the temperature of the atmosphere surrounding the disk plate and the head drive unit; A disk storage device comprising: a positioning correction circuit that inputs a combination of two pieces of temperature information and provides a correction signal to the positioning control circuit.