JPS62197971A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce sliding friction between a magnetic head and a magnetic disk, and to prevent the magnetic head or the magnetic disk from being damaged, by sliding the magnetic head in a seek direction, and also, changing a distance to be slided, based on a time while the rotation of the magnetic disk is ceased. CONSTITUTION:A control circuit 7, when receiving the start up signal of a spindle motor 1, checks the output of a timer 8, and rotates the spindle motor 1 as it is by a motor driving circuit 6 when the value of the output exceeds a certain value. And when it is below the certain value, the circuit 7 moves a head 3 by driving a carriage 4 with a servo circuit 5, and furthermore, when it is still below the certain value, a sliding distance is increased, and after completing the operation, the spindle motor 1 is rotated by the motor driving circuit 6. In this way, no effect is given on the magnetic head or the magnetic disk, and also, an absorbing accident can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of Industrial Application] Akira Kigame relates to magnetic disk devices, particularly to C3S type magnetic disk devices.

1 Conventional technology] In a CS S type magnetic disk device, a magnetic disk plate (
When the disk (hereinafter abbreviated as the disk) stops rotating, the magnetic head (hereinafter abbreviated as the head) is in contact with the disk. However, with the recent remarkable increase in magnetic recording density, it has become necessary for heads and disks to have a flat surface or very high flatness, so that the head and disk come into contact with each other. Due to this, an adsorption phenomenon may occur between the disk and the disk, and the sliding friction between the disk and the disk may become large. Excessive stress is applied to the head or disk, sometimes resulting in damage to the head or disk.

Conventionally, in this type of magnetic disk drive, before the disk is rotated, the front end slides a very small amount in the seek direction on the disk surface, thereby eliminating the sliding friction between the front end and the disk and creating an adsorption phenomenon. [Problem to be solved by the invention] In the above-mentioned conventional magnetic disk drive, when the disk is stopped, the head is damaged, albeit by a very small amount. Normal CS S
Since it will be slid in a different seek direction than the time,
...An excessive stress different from normal will be applied to the throat. In conventional devices, this operation is performed every time the disk is rotated, which may reduce the reliability of the head and disk, and because the amount of sliding is limited, the original effect may be reduced. There is a drawback that it becomes a problem.

[Means for solving problems]

The magnetic disk device of the present invention includes a timer that measures the time during which the rotation of the magnetic disk plate is stopped, and a timer that measures the time during which the rotation of the magnetic disk plate is stopped. and control means for sliding in the rake direction and changing the sliding distance.

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

FIG. 1 is a block diagram showing an embodiment of the magnetic disk device of the present invention. In the same figure, a spindle motor 1 is used to rotate a disk plate 2, and a motor and motor 4 are used to drive a servo circuit 5. Positioning the head 3 in the radial direction of the disc plate 2 by control 4
Timer 8 is a charging/discharging circuit using a capacitor, and is always charged at a certain voltage when spindle motor 1 is rotating, and when spindle motor 1 is stopped or power is not supplied to the device. When the control circuit 7 receives the start signal of the spindle motor 1, it looks at the output of the timer 8, and if the output is greater than or equal to the value, it causes the motor drive circuit 6 to rotate the spindle motor 1.
If it is less than the value, the servo circuit 5 carries out the carry.
・Move the throat 3 by driving the I-shape 4, and if it is less than the value, increase the sliding distance, and after this operation is completed, the motor drive circuit 6 drives the spindle motor 1.
Rotate.

〔Effect of the invention〕

As explained above, the present invention is designed to prevent damage to the disk by sliding the head in the seek direction before rotating the disk in order to prevent damage to the disk, which occurs when the disk is rotated when the throat and the disk are in an adsorbed state. However,... the adsorption force between the throat and the disc... The disc was stopped by taking advantage of the time the throat and the disc are in contact, which is related to the time the disc is stopped. By performing the sliding movement of the gutter appropriately depending on the time, there is no effect on the gutter or the disk, and there is the effect of preventing adsorption accidents.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the magnetic disk device of the present invention. 7 1. Spindle motor, 2. Disk plate, 3.
...He, So 1 Te, 4...-! 1i-A. Ridge, 5.
... Servo circuit, 6... Motor drive circuit, 7... Control circuit, 8... Timer.

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 timer for measuring the time during which the rotation of the magnetic disk plate is stopped; and a timer for starting the device according to the measured time, and sliding 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 also changing the sliding distance.