Tracking in hard disk drive using magnetoresistive heads

Details Tracking in hard disk drive using magnetoresistive heads Tracking in hard disk drive using magnetoresistive heads

1996-07-18

1998-06-23

Hindi, Nabil

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 5596

Patent

active

057711313

ABSTRACT:
An asymmetric quadrature-providing servo burst format for a tracking servo within a hard disk drive is particularly well suited for MR heads. The four-burst format may be written onto the disk with only two servo-writer passes per track by using an alternating one-third, two-thirds track pitch regimen. During operation of a drive incorporating the servo format of the present invention, the servo system uses an appropriate combination of bursts and burst sums, based on burst amplitude profiles, in order to achieve optimized position error signal (PES) continuity and linearity as the head moves off of nominal track centerline of each concentric data track.

REFERENCES:
patent: 4669004 (1987-05-01), Moon et al.
patent: 4802033 (1989-01-01), Chi
patent: 5138511 (1992-08-01), Hoshima et al.
patent: 5170299 (1992-12-01), Moon
patent: 5193034 (1993-03-01), Tsuyoshi et al.
patent: 5235478 (1993-08-01), Hoshimi et al.
patent: 5257149 (1993-10-01), Meyer
patent: 5268803 (1993-12-01), Sugita et al.
patent: 5369535 (1994-11-01), Hetzler

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