JPH02146109A - Disk medium and disk device formed by using this medium - Google Patents

Abstract

PURPOSE:To eliminate the attraction fault and head crash fault of a head and to enhance reliability by providing a CSS zone which positions the head at the time of starting the rotation of the disk medium or stopping the rotation and a stop zone which positions the head during the stop of the rotation on the disk medium. CONSTITUTION:The magnetic disk has a data zone 40, the CSS zone 30 and the stop zone 20. The CSS zone 30 is used at the time of starting the rotation of the magnetic disk and stopping the rotation, i.e. at the time of contact start stop. The head is positioned in the stop zone 20 while the rotation of the magnetic disk is held stopped. Since the CSS zone 30 and the stop zone 20 have adequate surface roughness and lubricity, the head floats or lands without giving damages to the magnetic disk and the magnetic head at the time of starting the rotation of the magnetic disk or stopping the rotation thereof. The stop zone 20 has the rough surface or is coated with the lubricating agent in the smaller amt. and, therefore, the attraction fault is hardly generated even if the magnetic head is held stopped.

Description

[Detailed Description of the Invention] [Summary] This invention relates to contact start/stop type disk drives, and in particular to magnetic disk media that improves the reliability of magnetic disk drives, by solving head adsorption failures, head crash failures, etc. The purpose of this system is to improve the reliability of disk devices.The system consists of a stop zone in which the head is positioned when the disk medium is stopped rotating, a CSS zone in which the head is positioned when the disk medium rotation starts or stops, and a stationary zone in which the head is positioned when the disk medium rotation starts or stops. A data zone is configured on the disk medium in which the head is positioned during rotation.

The surface roughness of the stop zone is made rougher than that of the CSS zone and the data zone, or the amount of lubricant of the stop zone is made smaller than that of the data zone and CSS zone. The disk medium also includes a means for detecting the rotational speed of the disk medium, and determines from the rotational speed detected by the means whether the rotation is stopped, when the rotation is started or when the rotation is stopped, or when the rotation is steady, and when the rotation is stopped, the disk medium is in the stop zone. The head is positioned in the C8S zone when the rotation is started or stopped, and in the data zone during steady rotation.

[Industrial application field]

The present invention relates to a contact start/stop type disk device, and more particularly to a magnetic disk medium that improves the reliability of a magnetic disk device.

In recent years, in order to simplify the magnetic head mechanism, a contact start/stop (hereinafter abbreviated as CSS) type magnetic head mechanism has been used in which the magnetic head lands on a magnetic disk medium when stopped.

[Conventional technology]

In order to reduce the amount of wear on the recording medium and head during C8S, or to improve head crash resistance, the recording media of magnetic disk devices using conventional C5S type heads are made by removing protrusions on the surface of the recording medium. In order to reduce the roughness and the wear coefficient of the recording medium, lubricants have been applied to the surface of the recording medium.

However, due to the reduction in surface roughness and the application of lubricant, the lubricant may be adsorbed to the head when the recording medium stops rotating, and the head support spring may sag during startup, causing the recording medium and head to not exhibit a normal flying posture. There was a risk that a suction failure would occur in which the recording medium or head core would be damaged due to collision. These failures are serious failures because they destroy recorded data or make it unreadable.

In order to solve the above problem, Japanese Unexamined Patent Publication No. 54-23508
As described in the above publication, a method of separating the data zone and the C8S zone has been proposed. As shown in FIG. 5, a CSS zone 33 is provided, and the C8S zone 33 has a rough surface so that the magnetic head will not be attracted to it, and the head is positioned in the CSS zone 33 during CSS.

[Problem to be solved by the invention]

However, even if the CSS zone as described above is provided, the head core slides in contact with the recording medium during CSS, and the head core may be damaged due to the rough surface of the CSS zone.

Therefore, it is an object of the present invention to solve problems such as head adsorption failures and head crush failures, and to improve the reliability of disk devices.

[Means to solve the problem]

As shown in FIG. 1, a CSS zone in which the head is positioned when the disk medium starts rotating or stops rotating, and a stop zone in which the head is positioned while the rotation is stopped are provided on the disk medium. The C8S zone and the data zone are configured to have small surface roughness, and the stop zone is configured to have a predetermined surface roughness. Alternatively, an appropriate amount of lubricant is applied to the C8S zone and the data zone, and a smaller amount of lubricant is applied to the stop zone than the above. Alternatively, it is configured to perform both at the same time.

It also includes means for detecting the rotational speed of the disk medium,
Based on the rotation speed detected by the means, it is determined whether the rotation is stopped, when the rotation is started or when the rotation is stopped, or when the rotation is steady, and when the rotation is stopped, the rotation is placed in the stop zone, and when the rotation is started or the rotation is stopped, the rotation is placed in the CSS zone, The head is configured to be positioned in the data zone during steady rotation.

[Function] The CSS zone also has appropriate surface roughness and lubricity,
To fly or land a head without damaging the magnetic disk and the magnetic head when the rotation of the magnetic disk is started or stopped. Furthermore, since the surface of the stop zone is rough or the amount of lubricant is small, adsorption failure is unlikely to occur even when the magnetic head is stopped.

〔Example〕

The configuration of the magnetic disk consists of a data zone 40, a CSS zone 30, and a stop zone 20, as shown in FIG. The CSS zone 30 of the present invention is used when the rotation of the magnetic disk starts and stops, that is, during CSS. When the rotation of the magnetic disk is stopped, stop zone 2
Position it at 0. Taking a 5.25-inch magnetic disk medium as an example, the data zone has a radius of 35 to 60 thresholds, the CSS zone has a radius of 31 to 35 mm, and the open/stop zone has a radius of 27 to 31 am. In this case, the C8S zone 30 and the stop zone 20 are provided near the center of the medium, but they may be provided near the outside of the medium.

The head position control is performed according to the rotation speed of the magnetic disk, for example, data zone 3600 rpm (steady rotation speed)C
5S zone 50~3600rpII+stop zone
Position the head at 0~50 rpm.

Figure 4A is a block diagram of the configuration of the head position control section, Figure 4B
C is the head position control when the magnetic disk starts rotating.
This explains the head position control when the rotation of the magnetic disk is stopped. In the figure, 51 is a magnetic disk device control unit;
52 is a positioning mechanism, 53 is a magnetic disk drive motor,
54 is a rotation detection circuit, and 55 is an index detection circuit. Based on the index signal sent from the index detection circuit 55, the rotation speed detection circuit 54 detects the rotation speed of the magnetic disk. Then, the control unit 51 controls the
Seek each zone according to the rotation speed as shown in .

FIG. 2 is a cross-sectional view when the surface roughness of the stop zone is increased. The data zone 41 and the CSS zone 31 have a surface roughness as small as possible, and the stop zone 21 has a predetermined surface roughness. As the surface roughness becomes rougher, the area where the head adheres to the magnetic disk becomes smaller, making it difficult for the head to stick to the magnetic disk. Further, the surface roughness may be set in three stages depending on each zone.

The manufacturing method for the above-mentioned magnetic disk is as follows: When finishing the surface, the front surface of the magnetic disk is precisely finished using a polishing machine, and then the same width as the stop zone 21 and the same width as the stop zone 21 are used. Only the stop zone 21 is brought to the desired roughness using a sander with coarse sandpaper.

Other methods include irradiating the surface with a laser beam to burn the surface layer to increase the surface roughness.

FIG. 3 is a cross-sectional view when the amount of lubricant in the stop zone is reduced. The data zone 42 and CSS zone 32 are lubricated conventionally, and the stop zone 22 is lubricated in a reduced amount. Naturally, since the amount of lubricant is small, the lubricant does not stick to the head, making it difficult for suction problems to occur. Further, the amount of lubricant may be set in three stages depending on each zone.

The method for manufacturing the above magnetic disk is as follows: Stop zone 2
2. Spin code a low concentration lubricant diluted solution from above. At this point a thin layer of lubricant forms on the front of the media. Next, CS
A diluted lubricant liquid having a higher concentration than the diluted liquid used above is spin-coded from above the S zone 32. This provides a sufficient thickness of lubricant in the CSS zone 32 and stop zone 42. Other methods include wiping off only the lubricant in the stop zone 22 with a cloth or the like after applying sufficient lubricant to the entire surface of the medium, or evaporating it by irradiation with a laser beam.

Further, it is also possible to simultaneously implement the two embodiments described above, and the durability against adsorption failure of the head can be further improved.

〔Effect of the invention〕

As explained above, head adsorption can be effectively prevented. Further, since the stop zone, C8S zone, and data zone are provided separately, the surface roughness of the data zone can be made as small as possible, and the flying height of the head can be reduced. The low flying height of the head makes it possible to increase the recording density of the magnetic disk medium. Therefore, it greatly contributes to increasing the magnetic disk drive's performance and recording density.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of the magnetic disk of the present invention, Fig. 2 is a cross-sectional view when the surface roughness is increased, Fig. 3 is a cross-sectional view when the lubricant is reduced, and Fig. 4 is a magnetic disk according to the present invention. FIG. 5 is a configuration block diagram of head positioning control of a disk device. FIG. 5 is a configuration diagram of a conventional magnetic disk. In the figure, 10.13...magnetic disk 20.21.
22...Stop zone 30.31, 32.33...C8S zone 40.
41.42.43 ... Data zone (A) (B book book 1: OK, do/l old part bud 4. The present invention's price discoo N floor No. 1 Fig. Ng goo life t1 and 1 filial duty <(rko 11 minutes nk
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Claims (1)

[Scope of Claims] [1] A disk medium used in a contact start-stop type disk device in which a head comes into contact with the medium and pauses while the rotation of the disk medium is stopped, which comprises: It is characterized by comprising a stop zone in which the head is positioned, a CSS zone in which the head is positioned when the rotation of the disk medium starts or stops, and a data zone in which the head is positioned during steady rotation of the disk medium. disk media. [2] The disk medium according to claim 1, wherein the surface roughness of the stop zone is rougher than that of the CSS zone. [3] The disk medium according to claim 1, wherein the amount of lubricant in the stop zone is smaller than that in the CSS zone. [4] A disk device using the disk medium according to claim 1, further comprising means for detecting the rotational speed of the disk medium, and the rotation speed detected by the means determines when the rotation is stopped, when the rotation is started, or when the rotation is stopped. When the rotation is stopped, the head is positioned in the stop zone, when the rotation is started or stopped, the head is positioned in the CSS zone, and during the steady rotation, the head is positioned in the data zone. A disk device characterized by: