Compact servo pattern optimized for M-R heads

Details Compact servo pattern optimized for M-R heads Compact servo pattern optimized for M-R heads

1997-08-07

2000-05-02

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7711, G11B 5596

Patent

active

060579773

ABSTRACT:
A disk drive system has a servo pattern with bursts that are recorded without multiple passes per burst and without trimming, so that the servo pattern bursts have the same width as the data tracks. The servo write steps occur in partial data track pitch (DTP) increments. A magneto-resistive (M-R) head is used to both record the servo pattern and transduce it. In a two-frequency system, relative gain calibration is performed using AGC circuitry to first calibrate one frequency and then the other. The resulting servo position error sensing (PES) signal has improved linearity and is simpler to write.

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patent: 5448430 (1995-09-01), Bailey et al.
patent: 5453887 (1995-09-01), Negishi et al.

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