JPH01184677A - Servo track writing device for magnetic disk - Google Patents

Abstract

PURPOSE:To shorten the time of writing and confirming by providing a magnetic head to write a servo track and the magnetic head for reading on the whole face of a servo face while facing to the servo face. CONSTITUTION:A disk body 5 is turned, a first carriage 22 is turned, a writing dedicated magnetic head 23 is moved to the outermost periphery of a servo face 4, and a servo track is written to the face 4 sequentially while moving toward an inner periphery. When the head starts writing, a second carriage 26 is turned, a reading dedicated magnetic head 27 is moved to the outermost periphery of the face 4, and a track written so as to follow the head 23 is read sequentially and verified. The positioning of the head 23 is executed by a first mirror 24 and a first laser range finder 25, and the positioning of the head 27 is executed by a second mirror 28 and a second laser range finder 29 respectively. Thus, the writing and confirming of the servo track to the servo face of the magnetic disk can be executed for a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk servo track writing device for writing servo tracks on a magnetic disk.

[Prior Art] Fig. 3 is a plan view showing a fixed magnetic disk device, and Fig. 4 is a front view of Fig. 3, in which (1) is a base, (
2) is a rotating shaft that is provided on the base (1) and is connected to a spindle motor (not shown) to rotate;
(3) are four magnetic disks that are integrally attached to the rotating shaft (2) and store information on both sides, and (4) is the topmost magnetic disk of the four magnetic disks (3).
3) is a servo surface located on the top surface, and this servo surface (
4) has information for determining the position for recording and reproducing information on the other seven data surfaces. (5) is the rotation axis (2)
and four magnetic disks (3), (
6) is a carriage whose proximal end is rotatably attached to the base (1), and (7) is fixed to the distal end of the carriage (6), and each of the four magnetic disks (3) 8 Recording and reproducing information on two sides 8
magnetic heads.

In such a magnetic disk device, when recording and reproducing information, first, the spindle motor is driven.
Rotate the disc 5).

Next, rotate the carriage (6) to open the magnetic head (7).
) onto each surface of the magnetic disk (3). At this time, the magnetic head (7) facing the servo surface (4) of the magnetic disk (3) reads position information from the servo surface (4). By controlling the carriage (6) and moving the magnetic head (7) based on this position information, information is recorded and reproduced at an appropriate position on the data surface of the magnetic disk (3).

By the way, in general, in order to record and reproduce information with high density on a magnetic disk, the positioning of the magnetic head with respect to the magnetic disk must be performed as accurately as possible.

Therefore, as mentioned above, a specific surface of the magnetic disk (3) is defined as a servo surface (4), and a large number of concentric tracks (hereinafter abbreviated as servo tracks) are placed on this servo surface (4) as position information. A method is used to write it down accurately. This servo track writing work on the magnetic disk (3) is performed in advance by a magnetic disk servo track writing device (hereinafter abbreviated as STW) before the magnetic disk (3) is attached to the fixed magnetic disk device. It is being said.

FIG. 5 is a plan view showing an example of a conventional STW, and FIG. 6 is a front view of FIG.
(12) has a proximal end that is the base for STW (11)
STW carriage rotatably attached to the top (
13) is an STW magnetic head (14) which is fixed to the tip of the STW carriage (12) and writes a servo track on the servo surface (4) of the magnetic disk (3) and reads out the written servo track for confirmation. is ST
The mirror (15) is a laser distance meter installed near the STW carriage (12) on the STW base (11) and directed toward the mirror (10). Yes, this laser distance meter (15)
The position of the STW carriage (12) is detected by the cooperation of the mirror (14) and the mirror (14).

In the conventional STW configured as described above, when writing a servo track on the servo surface (4) of the magnetic disk (3), the disk body ( 5) Rotating the STW magnetic head (13) is moved onto the servo surface (4) of the magnetic disk (3) by rotating the S/W carriage (12). and,
This STW magnetic head (13) allows the servo surface (4
), the servo tracks are written sequentially from the inner circumference to the outer circumference or from the outer circumference to the inner circumference. At this time, the positioning of the STW magnetic head (13) with respect to the servo surface (4) is performed using the magnetic radmirror ( 14) and laser distance meter (15)
) by accurately controlling the position of the STW carriage (12). Finally, STW again
It is only necessary to move the magnetic head (13) onto the servo surface (4) and read the written servo track to verify whether the servo track has been written correctly.

[Problems to be Solved by the Invention] In the conventional STW configured as described above, writing must be performed sequentially with one STW magnetic head (13) while accurately positioning a large number of concentric servo tracks. Moreover, when verifying after writing, the servo tracks must be read out sequentially from the servo surface (4) again using one STW magnetic head (13), so it takes a long time to write and verify the servo tracks. The problem was that it took time.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a servo track writing device for a magnetic disk that can write and confirm servo tracks on the servo surface of a magnetic disk in a short time. shall be.

[Means for Solving the Problems] A servo track writing device for a magnetic disk according to the present invention includes a writing magnetic head that writes servo tracks on the entire servo surface of a magnetic disk, and a writing magnetic head that writes servo tracks on the entire servo surface of the magnetic disk. A reading magnetic head for reading data is provided facing each servo surface.

[Operation] In the present invention, the writing and checking of servo tracks on the servo surface are performed by the writing magnetic head and the reading magnetic head.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of an STW showing an embodiment of the present invention, and FIG. 2 is a front view of FIG. Explanation will be omitted.

In the figure, (21) is a base to which the disk body (5) is rotatably and removably attached, (22) is a first carriage whose base end is rotatably attached to the base (21), (23) is a write-only magnetic head that is fixed to the tip of the first carriage (22) and writes a servo track on the entire surface of the servo surface (4) of the magnetic disk (3);
(24) is the first mirror attached to the middle part of the first carriage (22), and (25) is the first mirror (24) attached near the first carriage (22) on the base (21).
) is a first laser range finder provided to point toward.

(26) is a second carriage whose proximal end is rotatably mounted on the base (21), and (2)) is fixed to the tip of the second carriage (26) and is connected to the magnetic disk (3). A read-only magnetic head reads out the servo track written on the servo surface (4) for verification, (28) is a second mirror attached to the middle part of the second carriage (26), and (29) is the base. (21) A second laser range finder provided near the second carriage (26) above and directed toward the second mirror (28).

In the STW configured as described above, when writing and verifying servo tracks on the servo surface (4) of the magnetic disk (3), first the disk body (5) is rotated as in the conventional example. Next, the first carriage (22) is rotated to rotate the first magnetic head (23).
is moved to the outermost circumference of the servo surface (4), and from there, the write-only magnetic head (23) is moved toward the inner circumference to sequentially write servo tracks on the servo surface (4).

When the write-only magnetic head (23) starts writing on the servo track, the second carriage (26) is rotated to move the read-only magnetic head (2) to the outermost circumference of the servo surface (4). . And a read-only magnetic head (27)
While moving to follow the write-only magnetic head (23), the servo tracks written by the write-only magnetic head (23) are sequentially read and verified by the read-only magnetic head (27).

Also, the positioning of the write-only magnetic head (Z3) at this time is performed using the first mirror (24) and the first laser distance meter (25).
), the read-only magnetic head (27) is positioned by the second mirror (28) and the second laser rangefinder (29).
These are individually performed in the same manner as in the conventional example.

In this embodiment, a write-only magnetic head (23) and a read-only magnetic head (2) are used to write and read servo tracks on the servo surface.
This eliminates the need for a device for switching between writing and reading operations, and it is possible to optimize the characteristics of the writing magnetic head and the reading magnetic head.

In the above embodiment, the servo track is written and read from the outermost circumference of the servo surface (4) toward the inner circumference, but the servo track is written and read from the innermost circumference of the servo surface (4) toward the outer circumference. It may also be something that is read out.

Further, although the above embodiment uses four magnetic disks (3), any number of magnetic disks may be used.

Further, in the above embodiment, the upper surface of the uppermost magnetic disk (3) of the four magnetic disks (3) is used as the servo surface (4), but the servo surface is limited to the uppermost surface. It may be other aspects instead.

Furthermore, in the above embodiment, the write-only magnetic head (23) and the write-only magnetic head (27) are used as the write magnetic head and the read magnetic head, but for example, the conventional STW Magnetic head (13) 2111
The write magnetic head and the read magnetic head do not need to have write-only and read-only characteristics, such as using them for writing and for continuous output, respectively.

[Effects of the Invention] As explained above, the servo track writing device for a magnetic disk of the present invention includes a writing magnetic head that writes servo tracks on the entire servo surface of a magnetic disk, and a servo track writing device that writes servo tracks on the entire servo surface of the magnetic disk. Since the read magnetic head for reading the servo track is provided facing the servo surface, writing and checking of the servo track on the servo surface is shared between the write magnetic head and the read magnetic head, and the magnetic disk This has the advantage that writing and checking of servo tracks on the servo surface can be done in a short time.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a magnetic disk servo track writing device showing an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a plan view showing a fixed magnetic disk device, and FIG. The figure is a front view of FIG. 3, FIG. 5 is a plan view showing an example of a conventional magnetic disk servo track writing device, and FIG.
FIG. In the figure, (3) is a magnetic disk, (4) is a servo surface, (23) is a write-only magnetic head, and (2) is a read-only magnetic head. In each figure, the same reference numerals indicate the same or corresponding parts. Akira 1 figure 3: Cheek begging school 27゛*Miko... Senki to uniform de Kou 3 figure

Claims (1)

[Claims] A servo track is written on a magnetic disk built in a fixed magnetic disk device as positioning information for a magnetic head of the fixed magnetic disk device, and it is checked whether the servo track is accurately written. In a servo track writing device for a magnetic disk that reads out servo tracks for a magnetic disk, the servo track writing device is provided opposite to a servo surface of the magnetic disk on which the servo tracks are written, and is provided to face the servo surface on which the servo tracks are written on the entire surface of the servo surface. A servo track writing device for a magnetic disk, comprising: a magnetic head for reading the servo track from the entire surface of the servo surface, the read magnetic head being provided opposite to the servo surface and reading the servo track from the entire surface of the servo surface.