Apparatus for writing servo information onto a magnetic disk

Details Apparatus for writing servo information onto a magnetic disk Apparatus for writing servo information onto a magnetic disk

1990-06-29

1992-11-10

Dixon, Joseph L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7703, 360 7705, 74 96, G11B 5596

Patent

active

051629550

ABSTRACT:
An apparatus for writing servo tracks on a magnetic disk in a head disk assembly having a head, a moveable actuator for positioning the head relative to the disk, and an actuator drive for moving the actuator to position the head at selected radial positions relative to the disk for writing the servo tracks at those positions, the apparatus including a support for supporting the head disk assembly in the apparatus in a writing position to have the tracks written, a biased tracking element mounted to be biased against the actuator when the head disk assembly is in its writing position, thereby to track the movement of the actuator and the head to the selected radial positions, and a feedback circuit connected between the tracking element and the actuator drive for monitoring the position of said tracking element as a measure of the radial position of the head for controlling the action of the drive to move the head to the selected radial positions within a desired degree of radial accuracy.

REFERENCES:
patent: 4831470 (1989-05-01), Brunnett et al.
patent: 4980783 (1990-12-01), Moir et al.
Hewlett Packard Application Note 325-11 "Disk Drive Servo-Track Writing With Laser Interferometers".
Five Sheets of Technical Drawings for the WREN III STW, Jun. 15, 1989; CD/MPI.

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