JPH0612800A - Method for servo writing of magnetic disk device - Google Patents

Abstract

PURPOSE:To improve the accuracy of zero-track position at the servo pattern of a magnetic disk device regardless of the attaching accuracy of the magnetic disk device to a servo writer. CONSTITUTION:A burst signal in the state where a head arm 4 is pressed to a stopper 8 on an outer peripheral side by a voice coil motor 6 for driving the arm of the magnetic disk device 1, is recorded, and therafter, the push pin 12 of the servo writer 11 is driven by a voice coil motor 13 for driving a pin. The head arm 4 is pressed back by the push pin 12 and a position detecting means 14 detects the position where the reproduced output level of the burst signal is lowered to a prescribed value then the servo pattern is started to write while using the position of the push pin 12 as a reference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a servo write method for a magnetic disk device, and more particularly to a position where the 0 track of the servo pattern of the magnetic disk device is set to a micron regardless of the mounting accuracy on the servo writer of the magnetic disk device. It is designed so that it can be determined with unit accuracy.

[0002]

2. Description of the Related Art In a magnetic disk device, for example, a hard disk drive, a servo pattern is recorded on the hard disk using the magnetic head of the drive itself, and the movement and positioning of the magnetic head is performed outside the hard disk drive (magnetic disk device). It is known that an external positioning device separate from the hard disk drive is used.

[0003]

In the conventional magnetic disk device described above, in order to determine the 0 track of the servo pattern, the external positioning device itself prepared the reference position for the 0 track. It was necessary to accurately mount the magnetic disk device of the device.

However, in practice, it is difficult to accurately attach the magnetic disk device to the external positioning device, and therefore it has been difficult to determine the position of the 0 track on the order of several microns.

The present invention has been made for the purpose of solving the above-mentioned conventional problems and providing a servo write method capable of easily determining the position of the 0 track with an accuracy of a micron unit.

[0006]

According to the present invention, a disk as a recording medium, a magnetic head for writing and reading signals to and from the disk, a head arm to which the magnetic head is attached, and the head arm are moved. A magnetic disk device having an arm driving member for causing the head to move and a stopper for stopping the movement of the head arm brought into contact with the head arm moved by the arm driving member so that a servo pattern is recorded by the magnetic head. In the servo write method, the burst signal is recorded by the arm driving member in a state where the head arm is in contact with the stopper, and then the push pin of the servo writer is driven by the pin driving member, and the head arm is driven by the push pin. Is pushed back, and the position at which the reproduction output level of the burst signal drops to a predetermined value is detected by the position detecting means. It detected and were to start writing a servo pattern on the basis of the position of the push pin.

[0007]

As described above, after the burst signal in the state where the head arm is in contact with the stopper is recorded by the arm drive mechanism of the magnetic disk device, the push pin of the servo writer is driven and the head is driven by the push pin. The arm is pushed back, the position where the reproduction level of the burst signal drops to a predetermined value is detected by the position detecting means, and the servo pattern is started to be written based on the position of the push pin. Since it is held in the device itself, it is possible to obtain the position of the 0 track of the servo pattern with the accuracy of micron regardless of the mounting position accuracy of the magnetic disk device to the servo writer.

[0008]

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

FIG. 1 shows a magnetic disk device (hard disk drive) 1 on which servo writing is performed using the method of the present invention. The magnetic disk device 1 includes one or a plurality of hard disks 2 as recording media. , Upper and lower magnetic heads 3 for writing and reading signals to and from the hard disk 2, upper and lower head arms 4 to which the magnetic head 3 is attached, and a voice coil for rotating the head arm 4 about an axis 5. Arm drive member 6 consisting of a motor
And inner and outer stoppers 7 and 8 which come into contact with the head arm 4 moved by the arm driving member 6 to stop the movement of the arm 4 and regulate the rotation range thereof.
It is provided with an R / WIC for magnetic reproduction and an FPC 9.

The stopper 8 on the outer peripheral side is made of an elastic material such as rubber.

FIG. 2 is a block diagram of a servo writer 11 for determining a 0 track position which is used when writing a servo pattern on the hard disk 2 of the magnetic disk device 1.

The servo writer 11 includes a push pin 12 for pushing and moving the head arm 4 of the magnetic disk device 1, a pin driving member 13 including a voice coil motor for driving the push pin 12, and the push pin 12. Position detection means 14, a position control servo controller 15, an R / W amplifier 16 and a buffer amplifier 17 for amplifying a signal reproduced from the hard disk surface by the magnetic disk device 1, and a buffer amplifier 17 A sample and hold amplifier 18 for converting an analog signal from A to a digital signal and A /
A D converter 19 and a CPU 2 for processing data converted into a digital signal, transmitting a write signal to the magnetic disk device 1 or transmitting a command to the servo controller 15.
It consists of 0. The position detecting means 14 includes a laser emitting section 21, a laser receiving section 22, and an optical mirror 2.
3, 24 are provided.

Next, a method of recording a servo pattern on the magnetic disk device 1 using the servo writer 11, that is, a servo write method will be described.

A current is applied to the boss coil motor as the arm driving member 6 of the magnetic disk device 1 so as to generate torque from the inner peripheral side to the outer peripheral side, and the head arm 4 is pressed against the stopper 8 on the outer peripheral side.

When the stresses in the head arm 4 and the stopper 8 are balanced and the head arm 4 is completely stopped, a burst signal is recorded on the hard disk 2 by the magnetic head 3 and the reproduction output level of the burst signal is set to a buffer amplifier. Amplification and analog / digital conversion are carried out by 17, A / D converter 19, etc., and the value V1 is stored in the CPU 20.

Thereafter, the push pin 12 in contact with the outer side of the head arm 4 pressed against the stopper 8 on the outer peripheral side is inward by the boss coil motor as the pin driving member 13, that is, the stopper 7 on the inner peripheral side. To the side 1
Move by μm. At the same time, while monitoring the reproduction output of the previously stored burst signal, the position detecting means 14 detects the position at which V1 / 2 is reached, and this position is the origin of the positioning system, that is, the servo pattern 0. As the track position, the magnetic head 3 of the magnetic disk device 1
Then, the servo pattern is recorded on the hard disk 2.

When the outside stopper 8 is made of an elastic material such as rubber, when the head arm 4 is pressed against the stopper 8, the stopper 8 is deformed.

Therefore, in this case, the push pin 12 is moved inward from the origin by the amount (amount) of the deformation of the stopper 8, and the servo pattern is started to be recorded with this position (point) as the 0 track.

The stopper 8 is made of an elastic material so that the recording area of the hard disk 2 can be expanded to the outer peripheral side of the hard disk 2.

[0020]

The servo write method of the magnetic disk device of the present invention has the following effects.

(1) The reference of 0 track can be given to the magnetic disk device itself, and therefore, the position of 0 track of the magnetic disk device can be set regardless of the accuracy of the mounting position on the servo writer of the magnetic disk device. It is possible to determine with an accuracy of several microns.

(2) It is possible to use an existing servo writer without using a special sensor or device and only change the algorithm at the time of servo writing. Further, the magnetic disk device can be applied regardless of its type such as size and capacity.

[Brief description of drawings]

FIG. 1 is a plan view of a magnetic disk device.

FIG. 2 is a configuration diagram of a servo writer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magnetic disk device 2 ... Disk 3 ... Magnetic head 4 ... Head arm 6 ... Arm drive member (voice coil motor) 7, 8 ... Stopper 11 ... Servo writer 12 ... Push pin 13 ... Pin drive member (voice coil motor) 14 ... Position detection means

Claims (2)

[Claims] 1. A disk as a recording medium, a magnetic head for writing and reading signals to and from the disk, a head arm to which the magnetic head is attached, an arm drive member for moving the head arm, and the arm. A servo write method for a magnetic disk device, comprising: a stopper that abuts on a head arm moved by a drive member to stop the movement of the arm, wherein the magnetic head records a servo pattern. After the burst signal in the state where the head arm is brought into contact with the stopper by the driving member is recorded, the push pin of the servo writer is driven by the pin driving member, and the head arm is pushed back by the push pin, and the burst signal of the burst signal The position detecting means detects the position where the reproduction output level has dropped to a predetermined value, and A servo write method for a magnetic disk device, characterized in that a servo pattern is started to be written based on the position of the magnetic disk. 2. The stopper is formed of an elastic member, and when the head arm is pressed, the pressure causes the stopper to be deformed, and the push pin is moved by the deformed amount, and the servo is performed based on this point. A servo write method for a magnetic disk device that starts writing a pattern.