JPS63271777A - Servo writing device - Google Patents

Abstract

PURPOSE:To improve the production efficiency by feeding the result of detection back to a control means when a defect is detected on the track surface with initialization of a desired track, and correcting the writing position of the servo information. CONSTITUTION:When the servo information is written onto the surface of a magnetic disk 7, a specific data track is also initialized on the surface of a magnetic disk 8 with which the request specifications must be satisfied. If the relevant track does not satisfy the specification, the write starting position is offset for the servo information to avoid the track position. Thus, it is possible to eliminate the defect due to a fact that the request specifications are not satisfied with a specific track when a disk device is initialized. As a result, production efficiency of the disk device is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a servo write device, and more particularly to a servo write device that initializes a desired track during servo write.

[Conventional technology]

Conventionally, in the manufacturing process of a magnetic disk device, a magnetic disk is assembled into a spindle, and servo information for performing one-position control is written using a dedicated servo write device. FIG. 3 shows a flowchart of the manufacturing process of a conventional magnetic disk device.Hereinafter, the manufacturing process of the magnetic disk device will be explained with reference to FIG.

First, install a magnetic disk in the spindle (3o1),
Dynamic imbalance is corrected (302).

Next, the servo information is written by the servo write device (303). Such a servo write method is as follows.
For example, as shown in Japanese Unexamined Patent Publication No. 56-87262, there is a device that writes servo information by controlling the position of the magnetic head using a magnetic head position detection device and a head access mechanism of a magnetic disk device. Are known.

After this servo writing, the magnetic disk on which the servo information has been written is assembled into the carriage assembly (304), various parts are attached, and then the carriage is sealed (305). Next, the fastening strain is removed (306), and the mounted magnetic head is initialized (307). In the second initialization, if there are no defects, the magnetic disk device is completed (308). If there is a defect (defect).

Remove various parts, remove the carriage assembly, and replace the magnetic disk.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, no consideration was given to meeting the customer's required specifications for a specific data track positioned by the servo information at the stage of writing servo information onto the magnetic disk surface by the servo write device. In other words, in the manufacturing process of a magnetic disk device, if it is found that the product does not meet customer specifications at the stage where initialization has been performed after servo writing,
Since it is necessary to disassemble the assembled magnetic disk device and replace the magnetic disk when it is determined that the magnetic disk medium is defective, there is a problem in that production efficiency decreases.

An object of the present invention is to provide a servo write device that can solve such conventional problems and prevent a decrease in the production efficiency of a magnetic disk device due to a specific data track being less than specified in the manufacturing process of the magnetic disk device. There is a particular thing.

(Means for Solving the Problems) In order to solve the above problems, the servo write device of the present invention provides a magnetic disk drive for writing servo information on at least one surface of one or more magnetic disks constituting a magnetic disk device. In a servo write device having a head, an access means for positioning the magnetic head at a desired position, and a control means for controlling the access means and writing servo information, the access means is provided separately from the magnetic head. Arranging at least one magnetic head to face a desired position on the surface of the magnetic disk, and using the arranged magnetic head,
A desired track on the magnetic disk surface on which servo information is written is initialized, and when a defect on the track surface is detected by the initialization, the result is fed back to the control means to correct the servo information writing position. It has characteristics.

[Effect]

In the present invention, when writing servo information onto the magnetic disk surface in a servo write device, a certain specific data track on the magnetic disk surface that must satisfy required specifications is simultaneously initialized, and any track that does not satisfy the specifications is initialized. In some cases, the servo information writing start position is offset to avoid the track position.

As a result, it is possible to eliminate defects caused by a specific track falling short of the required specifications at the initialization stage of the disk device, thereby improving the manufacturing efficiency of the disk device.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a block diagram of a servo write device to which the present invention is applied.

This servo write device consists of a magnetic head 1 for writing servo information on the upper surface of a magnetic disk 7, an arm 2 on which the magnetic head 1 is mounted, and an arm 2 that holds the arm 2 and moves over the magnetic disk. It is composed of an access mechanism 3 and a position detection mechanism 4 for positioning the object at a target position. The access mechanism 3 also includes a magnetic head 5 for initializing a particular track, which is disposed at a position facing the upper surface of the magnetic disk 8, that is, at the same position on the cylinder 13 as the magnetic head 1. And the arm 6 carrying this is held.

In a servo write device having such a configuration, when writing servo information, the magnetic disks 7 to 9 are held by a base assembly consisting of a base 10 and a spindle 11, and the disk base assembly serves as a support for the servo write device. It is held by a mechanism 12. This state is shown in FIG. 2. Furthermore, the magnetic head 5 receives a signal from the position detection mechanism 4 indicating that a desired specific track has been reached, initializes the magnetic disk surface, determines defects, etc., and controls the control. A circuit (not shown) is connected. If there is a defect in that particular track position, the control circuit (not shown)
By correcting the writing start position of servo information, a specific track position can avoid a defective part and satisfy the desired specifications.

Here, the specific track means, for example, in a certain magnetic disk device, if there is a defect on a part of the track when the magnetic disk is initialized, that track will not be used. This is specifically stipulated because the track positioned as the track for storing the heading used to search for desired information from the magnetic disk device must not be the unusable track, and such an example is unique. It's not a thing.

FIG. 1 is a flow chart for explaining the operation of a servo write device showing one embodiment of the present invention. this is,
3 is a control flowchart in the servo write device of FIG. 2. FIG. The operation of this embodiment will be explained below according to the flowchart of FIG.

First, a control circuit (not shown) receives a signal from the 1-position detection mechanism 4, controls the access mechanism 3, accesses the servo information writing start position, and writes the servo information (101
). Next, it is determined whether the position is a desired specific track position on the magnetic disk surface (102).

If the position is not a specific track position, servo information is written by the magnetic head 1 (103).

The process moves on to writing servo information for the next track (104).

In the judgment of process 102, if it is a specific track position, the specific track is initialized (step 10).
5) Check for defects (106). If there is a defect, give a correction amount to the writing start position (107) and perform process 10.
Return to 1. If there is no defect, write the servo information as is.

As described above, in this embodiment, by initializing a specific track when writing servo information by the servo write device, which is a relatively early stage of the magnetic disk device manufacturing process, if there is a defect, the servo information is By correcting the writing start position, defects can be virtually eliminated and manufacturing efficiency can be improved.

Note that any changes may be made without departing from the spirit of the present invention; for example, in a magnetic disk drive with even more advanced functionality, up to a plurality of defects may be tolerated at the time of initialization; In cases where there should be no defects within a certain range, the method is not limited to correcting the track position as in the above embodiment.
A method may be used to avoid defects within a certain range by correcting the writing start position within the same track.
It is clear that the above examples do not limit the scope of the invention in any way.

〔Effect of the invention〕

As explained above, according to the present invention, in the initialization carried out at the final stage of the magnetic disk device manufacturing process,
Since it is possible to prevent a decrease in manufacturing efficiency caused by a defective magnetic disk device due to a certain data track not meeting required specifications, the production efficiency of the magnetic disk device is improved.

[Brief explanation of the drawing]

FIG. 1 is a flow chart for explaining the operation of a servo write device showing an embodiment of the present invention, FIG. 2 is a block diagram of a servo write device to which the present invention is applied, and FIG. 3 is a diagram of a conventional magnetic disk device. It is a manufacturing process diagram. 1: Magnetic head for writing servo information, 2, 6: Arm, 3
: Agesess mechanism, 4: Position detection mechanism, 5: Initializing magnetic head, 7 to 9: Magnetic disk, 10: Base, 11 Niji spindle, 12: Disk/base holding mechanism, 13 Niji cylinder. Figure 1 Figure 2

Claims (1)

[Claims] 1. A magnetic head for writing servo information on at least one surface of one or more magnetic disks constituting a magnetic disk device, an access means for positioning the magnetic head at a desired position, and a servo for controlling the access means. A servo write device having a control means for writing information, wherein at least one magnetic head is disposed in the access means in addition to the magnetic head so as to face a desired position on the surface of the magnetic disk, Using a magnetic head,
A desired track on a magnetic disk surface on which servo information is written is initialized, and when a defect on the track surface is detected by the initialization, the result is fed back to the control means to correct the servo information writing position. Characteristic servo light device.