JPS62197972A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent the damage of a magnetic head or a magnetic disk due to an absorption phenomenon between the head and the disk, by sliding the magnetic head in a seek direction according to the measurement of humidity in the neighborhood of the magnetic head and the magnetic disk, and also, changing a distance to be slided. CONSTITUTION:A control circuit 7, when receiving the driving signal of a spindle motor 1, checks the output of a humidity detector 8, and when the output detects a value below a certain level of humidity, it drives the spindle motor 1 as it is by a motor driving circuit 6, then rotating a disk 2. If a detected humidity exceeds the certain value, a carriage 4 is driven by a servo circuit 5, and a head 3 is moved before driving the spindle motor 1. Furthermore, when the value still exceeds the certain value, the distance to be driven is increased, and the control circuit 7 rotates the spindle motor 1 by the motor driving circuit 6 after an operation to increase the distance. In this way, no influence is given on the head or the disk, and it is possible to prevent an accident due to absorption.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, particularly a CSS type magnetic disk device.

[Conventional technology]

In a CSS type magnetic disk device, when a magnetic disk plate (hereinafter abbreviated as a disk) stops rotating, a magnetic head (hereinafter abbreviated as a head) is in contact with the disk. On the other hand, with the recent remarkable increase in magnetic recording density, heads and disks are required to have extremely high surface roughness or flatness. For this reason, when the head and disk come into contact, an adhesion phenomenon occurs between the head and the disk, increasing the sliding friction between the head and the disk. Because excessive stress is applied by the disk in the direction of rotation, it can sometimes cause damage to the disk.

Conventionally, on this type of magnetic disk surface, before rotating the disk, the head was slid on the disk surface by a very small amount in the seek direction to reduce the slippage between the disk and the disk. This is intended to prevent damage to the head or disk due to adsorption phenomena.

[Problem that the invention seeks to solve]

In the above-mentioned conventional magnetic disk device, when the disk is stopped or stopped, the head is exposed to the normal CS, albeit only by one stroke.
Since the head is to be slid in a seek direction different from that during S, an excessive stress different from normal is applied to the head. In conventional devices, this type of operation is performed every time the disk is rotated, which may reduce the reliability of the disk.Also, since the amount of sliding is limited, the original effect cannot be achieved. The disadvantage is that it will reduce the

[Means for solving problems]

The magnetic disk device of the present invention includes a humidity detector that measures the humidity around the magnetic head and the magnetic disk, and a humidity detector that starts the device based on the measured value, slides the magnetic head in the theta direction on the surface of the magnetic disk, and and control means for changing the moving distance.

〔Example〕

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

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

In the figure, a spindle motor 1 drives a disk plate 2 to rotate. The carriage 4 positions the head 3 in the radial direction of the disk plate 2 under the control of a servo circuit 5. The humidity detector 8 detects the humidity around the disk plate 2 and the head 3. When the control circuit 7 receives the drive signal for the spindle motor 1, it checks the output of the humidity detector 8, and if the humidity is detected to be below the humidity level, the motor drive circuit 6 directly drives the spindle motor 1 to rotate the disk plate 2. let

If the detected humidity exceeds the specified value, the servo circuit 5 controls the carriage 4 before driving the spindle motor 1.
The control circuit 7 drives the spindle motor 1 by the motor drive circuit 6 after completing this operation.
Rotate.

〔Effect of the invention〕

As explained above, in the present invention, the head is slid in the theta direction before the disk rotates in order to prevent damage to the head or disk that would occur if the disk is rotated when the head and disk are in an adsorbed state. Since the adsorption force generated between the head and the disk is related to the humidity of the surrounding area where the head and disk are placed, the sliding movement of the head can be performed appropriately depending on the humidity around the head and disk. This has the effect of preventing accidents due to adsorption without affecting the disk in any way.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a magnetic disk device of the present invention. 1... Spindle motor, 2... Disc plate, 3...
... Head, 4... Carriage, 5... Servo circuit, 6... Motor drive circuit, 7... Control circuit, 8...
・Humidity detector.

Claims (1)

[Claims] In a contact start/stop type (hereinafter referred to as CSS type) magnetic disk device, in which a magnetic head is in contact with a magnetic disk plate while the magnetic disk plate stops rotating,
a humidity detector that measures the humidity around the magnetic head and the magnetic disk; and a humidity detector that starts the device based on the measured value and slides the magnetic head in a seek direction on the surface of the magnetic disk before rotating the magnetic disk plate; A magnetic disk device characterized by comprising: control means for changing the sliding distance.