JPH08147910A - Method for writing servo signal writing clock - Google Patents

Abstract

PURPOSE: To write a servo signal writing clock on a zone texture type magnetic disk without causing trouble of attracting a clock writing magnetic head to the disk, etc. CONSTITUTION: After floating the clock head 6 above a landing zone 5A of the disk 5 applied with a zone texture in the landing zone 5A of a data head 4 in the inner circumferential part, the clock head 6 is moved to the outer circumferential side 5B of the disk 5 to write a clock therein. Consequently, the clock head 6 is positioned in the landing zone 5A where minute projections for preventing the data head from being attracted are formed, and is afterward floated up by rotating the disk 5, thus preventing the clock head 6 from being attracted to the disk 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for writing a clock for writing a servo signal, and more specifically, a magnetic recording medium such as a hard disk used in a magnetic disk device,
In particular, the present invention relates to a method for easily writing a servo signal writing clock on a zone-textured magnetic recording medium.

[0002]

2. Description of the Related Art Generally, when a magnetic recording medium such as a hard disk is used, the magnetic recording medium is rotated at a high speed to float a magnetic head, and writing and / or reading to / from the hard disk is performed via the magnetic head. Is going.

By the way, the magnetic recording medium is provided with minute protrusions on its surface by the texture processing in order to prevent the head from adsorbing to the medium surface when the rotation is stopped. However, when such a protrusion is provided, the distance between the head and the medium increases by the amount of the protrusion, which hinders the improvement of recording characteristics. Is as smooth as possible,
A method has been proposed in which a protrusion is provided only in a portion where the data head is located when the rotation is stopped, that is, in the landing zone (hereinafter, forming the protrusion only in the landing zone portion is referred to as "zone texture"). . Such zone texture is usually applied to the inner peripheral side of the disk-shaped magnetic recording medium.

On the other hand, since the servo signal writing clock is written on the outer peripheral side of the medium, the clock writing magnetic head is normally located on the outer peripheral portion of the medium and floats on this outer peripheral portion.

[0005]

In the medium having the zone texture on the inner peripheral side, there are not enough protrusions on the outer peripheral side. For this reason, when the clock writing magnetic head is attempted to float above the medium on the outer peripheral side, there is a problem that the head and the medium are attracted to each other.

The present invention solves the conventional problems described above, and easily writes a servo signal writing clock to a zone texture type magnetic recording medium without causing a trouble such as a magnetic head for clock writing adhering to the medium. The purpose is to provide a method.

[0007]

A servo signal writing clock writing method according to the present invention is a magnetic recording medium in which a magnetic head levitating from a magnetic recording medium reads and writes a record, and the inner circumference thereof is In a method of magnetically writing a clock for writing a servo signal on the outer peripheral portion of a magnetic recording medium in which a landing zone of a data head is provided in a portion, a magnetic head for clock writing is floated in the landing zone, It is characterized in that the recording medium is moved to the outer peripheral side and the clock is written in the outer peripheral portion.

[0008]

In the method of the present invention, the clock writing magnetic head is placed in the landing zone of the zone textured inner data head, and then the magnetic recording medium is rotated to rotate the clock writing magnetic head. Since the head is levitated in the landing zone in which the minute protrusions for preventing the attraction are formed, it is possible to prevent the attraction of the clock writing magnetic head to the magnetic recording medium.

[0009]

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of a servo signal writing device for explaining a method of an embodiment of a clock writing method of the present invention.

The clock writing method of the present invention uses the zone texture disk 5 in which the texture is provided only in the landing zone 5A of the inner data head.
With the servo signal writing device shown in FIG. 1, for example, the following steps (1) to (3) are performed, and the written clock signal is used to write the servo signals in the following steps (1) to (5) to complete a series of writing operations.

The corner cube 3 is set in the data head (recording / writing magnetic head) 4. Clock head (clock writing magnetic head)
Set 6. At that time, the clock head 6 is set at the position of the landing zone 5A on the inner peripheral side of the textured disk 5 as shown by the chain double-dashed line 6A. Rotate the disk 5. As a result, the clock head 6A floats in the landing zone 5A of the disk 5.

The clock head 6 is moved by the stepping motor 7 to the outer peripheral portion 5B side of the disk 5 which is the clock writing position. The reference clock is written on the outer peripheral portion 5B of the disk 5 by the clock head 6. Note that the clock write signal is written only on one side of the disk 5. A servo write signal is created using this clock signal, and the data head 4 writes the servo signal. At this time, the data head 4 is positioned by the laser positioning device 1.

The clock head 6 is returned to the position of the textured landing zone 5 A on the inner peripheral side of the disk 5. The rotation of the disk 5 is stopped. As a result, the clock head 6A lands on the landing zone 5A of the disk 5. The clock head 6 is released from the hard disk drive 2, and the corner cube 3 is removed from the data head 4.

The data head 4 is controlled by the mechanism of the drive 2 so as to automatically move to the zone texture portion on the inner peripheral side when the disk 5 is stopped.

According to the above procedure, it is possible to write the clock signal without causing the adsorption of the clock head.

The following methods can be given as suitable methods for applying zone texture to the magnetic recording medium.

That is, for example, the substrate surface of the medium or an underlayer made of a non-magnetic material such as NiP plating provided on the substrate surface is mechanically polished in the circumferential direction of the medium in a substantially concentric manner. A mechanical texture that leaves a mark can be mentioned. Further, as a more preferable method, a method of forming a texture pattern with a laser may be used instead of the mechanical texture. This method is preferably carried out directly on the substrate or after providing an underlayer made of a nonmagnetic material such as NiP,
This is performed by rotating the substrate while irradiating the surface thereof with a laser whose output is accurately controlled along the circumferential direction to form protrusions on the surface. In this case, usually
The intensity of the laser used is 20 to 500 mW, the average irradiation time is about 0.05 to 100 μsec, the laser spot diameter is 0.2 to 4 μm, and the linear velocity of the substrate is 0.8 to 15 m /
sec is preferred. Here, the average irradiation time of the laser refers to the time for which the substrate or the surface of the base layer on the substrate is irradiated with the laser in order to form one protrusion.

[0019]

As described in detail above, according to the servo signal writing clock writing method of the present invention, when writing the servo writing clock signal to the disk-shaped magnetic recording medium having the zone texture, the clock writing is performed. The magnetic head for magnetic recording is prevented from being attracted to the medium, and the servo write clock signal can be written easily and efficiently.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a servo signal writing device for explaining a method of an embodiment of a clock writing method of the present invention.

[Explanation of symbols]

 1 Laser Positioning Device 2 Hard Disk Drive 3 Corner Cube 4 Data Head 5 Disk 6 Clock Head 7 Stepping Motor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsunori Mochida 1000 Kamoshida-cho, Aoba-ku, Yokohama-shi, Kanagawa Mitsubishi Chemical Corporation Yokohama Research Institute

Claims (1)

[Claims] 1. A magnetic recording medium for reading and writing a recording by a magnetic head floating above the magnetic recording medium, the outer peripheral portion of the magnetic recording medium having a landing zone of a data head on the inner peripheral portion thereof. In the method for magnetically writing a clock for writing a servo signal, the clock writing magnetic head is levitated in the landing zone and then moved to the outer peripheral side of the magnetic recording medium to write the clock to the outer peripheral portion. And a method for writing a clock for writing a servo signal.