Off-track PES calibration for a magneto-resistive element

Details Off-track PES calibration for a magneto-resistive element Off-track PES calibration for a magneto-resistive element

1996-08-30

1999-02-02

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360 7704, G11B 5596

Patent

active

058673539

ABSTRACT:
A method and apparatus for creating a position error signal (PES) voltage v. track distance curve for the head of a hard disk drive. The disk has a dedicated track which contains a plurality of servo bits that allow the head to be centered with the centerline of the track. The dedicated track also has a number of calibration bits each embedded at a known location off-set from the track centerline. The PES voltage v. track distance curve is generated by reading each calibration bit and storing the corresponding amplitude of the position error signal in a memory device of the disk drive. Each calibration bit is located from the track centerline a distance that is different from the other calibration bits so that there are provided multiple points on the track curve.

REFERENCES:
patent: 5121260 (1992-06-01), Asakawa et al.
patent: 5400201 (1995-03-01), Pederson
patent: 5436773 (1995-07-01), Hanson
patent: 5455724 (1995-10-01), Suzuki et al.

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