JPS6157086A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce the floating time of magnetic head and to mitigate the risk of head crush by setting more frequent position of the yoke and approximately at zero and by setting the position as track zero. CONSTITUTION:Th more frequently using track of magnetic disk 3 is alloted at the vicinity of yoke angle of 0 deg., i.e. the zero yoke angle is set at substantially the center of track range L. The more frequently using zero track is indexed at the substantially central portion of tracking region and tracks 1, 2... are indexed in any order. The more frequently using track is set at the vicinity of zero yoke angle so that the magnetic head is positioned for a longer time at the position having higher floating margin so as to eliminate the risk of head crush, etc. and to provide magnetic disk device having high margin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device having a rotary actuator, and in particular, to reducing the influence of fluctuations in the flying height of a head that occur when the magnetic head seeks, thereby improving reliability. This invention relates to an improved magnetic disk device.

Magnetic disc devices play the role of peripheral storage devices for computers. They hold a magnetic head with a small gap between them on a high-speed rotating magnetic disk, and record information on a large number of concentric tracks. 5.

The above-mentioned magnetic head levitates as the magnetic disk rotates and performs reading/writing, but as magnetic disk drives become more dense and the flying height of the magnetic head is set smaller, head crashes occur. Because it becomes easier to
There is a demand for a magnetic head that does not cause head crash.

[Prior Art] 1. As shown in FIG. 2, for example, a magnetic disk drive consists of a magnetic disk 3 rotated by a spindle 2 having a motor 1, and an arm 5 attached to a rotary actuator 4 for driving a head. It consists of a magnetic head 7 supported by the arm 5 via a gimbal spring 6. Note that 8 is a base, and 9 is a rotation axis for rotating the arm.

In the above-mentioned magnetic disk device, an arm 5' carrying a magnetic head 7 rotates about a rotating shaft 9 as a fulcrum, as shown in FIG.・It has a structure that allows Tsuku to position it.

[Problem that the invention seeks to solve]

The rotary actuator 4 rotates around a rotating shaft 9 and does not move forward like a linear actuator, so it is small and
Although it has the advantage of being lightweight, the yaw angle (the angle between the tangent of the track in the circumferential direction and the heel/nod slider) depends on the radial position, and as shown in Figure 3 (a), θ is O1 at the center.
θ at the outermost position.

There is a problem in that it fluctuates to -θ at the innermost position.

Due to this variation in the yaw angle θ, the amount of air input to the slider 10 of the magnetic head 7 changes as shown in FIGS. There is a phenomenon in which the flying height is highest when the yaw angle of the inner and outer parts is 0 degrees, and the flying height decreases where the yaw angles of the inner and outer parts become more misaligned. Note that 1) is a core, and 12 is a coil.

For this reason, truck territory t! In order to minimize this variation in f(L), the yaw angle is set to 0 degrees at the center of the track area as shown in FIG.

In addition, in a magnetic disk device, when the magnetic disk starts to be used, the magnetic disk starts rotating, and when it reaches a specified number of rotations, the magnetic head is positioned at track 0, and the magnetic head is used from track 0, so that the frequency of use is the highest. Since the most frequently used track 0 is located at the innermost or outermost position of the magnetic disk 3 as shown in FIG. Since the time is long, there is a problem that there is a high risk of head crash due to contact with the magnetic disk.

[Means for solving problems]

The problem with the conventional method is that the angle between the tangent between the slider of the magnetic head and the track in the circumferential direction at a frequently used track position of the magnetic disk is approximately 0 degrees, and that position is track O. Solved by disk device.

[Effect]

In other words, the yaw angle is set to 0 degrees at the center of Li of one rack area of the magnetic disk, and the track 0, which is the most frequently used position, is set aside, and the flying time of the magnetic head in the area with a large flying height margin is calculated. By making the head longer, the risk of head crash is prevented.
□ [Example] □ The gist of the present invention will be specifically explained below with reference to the drawings.

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

In FIG. 1, frequently used tracks on the magnetic disk 3 are assigned to positions near a yaw angle of 0 degrees. That is, the position of the yaw angle of 0 degrees is set approximately at the center of the track area shown in FIG. 4, but the track is 0 from the innermost track as in the conventional case shown in FIG.

Rather than assigning 1 track, 2 tracks, etc., the frequently used O track is assigned to approximately the center of the track area, and 1-rack 1. Track 2, ---
--assign in any form. For example, outerwear like Zushu.

Assign track numbers to inner alternates.

As mentioned above, by setting the frequently used track to a position where the yaw angle is as small as possible near 0, the magnetic head can be located in a place with a large flying margin for a long time, eliminating the risk of head crash etc. According to the present invention, frequently used tracks are located near O where the yaw angle is as small as possible, and a flying margin is provided to eliminate head crashes that occur during magnetic helical seek. Levitation of the head! , a magnetic disk device with reduced influence of fluctuations and improved reliability can be obtained.

[Brief explanation of drawings]

Figure 1 is a diagram explaining one embodiment of the present invention, Figure 2 is a schematic diagram of a magnetic disk device, Figure 3 (a) is a diagram explaining the operation of a rotary actuator, and Figure 3 (b) is a diagram of a magnetic head. The side view of Figure 3 (c) is the side view of the
FIG. 4 is a diagram illustrating fluctuations in flying height due to head fluctuations, and FIG. 5 is a diagram illustrating conventional track area yoke angles and 1-rank assignments. In the figure, 2 indicates a magnetic disk and 3 indicates a sundr. Figure 1 Figure 2

Claims (2)

[Claims] (1) In a magnetic disk device in which a magnetic head held by an arm of a rotary actuator is positioned on a predetermined track on a magnetic disk to read/write, the slider of the magnetic head is positioned at a frequently used track position on the magnetic disk. A magnetic disk device characterized in that an angle (yaw angle) formed with a tangent to a track in a circumferential direction is approximately 0 degrees. (2) The magnetism according to claim 1, wherein the angle (yaw angle) formed by the tangent between the slider of the magnetic head and the track in the circumferential direction is assigned a position near 0 degrees as track 0. disk device.