Head position detecting method and apparatus

Details Head position detecting method and apparatus Head position detecting method and apparatus

1994-02-08

1996-06-04

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7814, 360 51, G11B 5596

Patent

active

055239005

ABSTRACT:
A head position detecting method and apparatus for detecting a phase difference from servo data on a recording medium to detect the position of a head. This head position detecting method and apparatus detect the phase differences between the read pulse of the servo data read by the head and reference clocks, and average the phase differences to detect the head position. A training area having a timing signal recorded therein is provided before the servo data on the recording medium. A phase-lock loop circuit for generating reference clocks is synchronized with the timing signal to accurately detect the phase differences. An integrator is used to average the phase differences. This design ensures accurate detection of the head position even under fast seek. Further, a phase difference signal around a target cylinder is obtained by selecting the phase of the reference clock in accordance with the position of the target cylinder.

REFERENCES:
patent: 4549232 (1985-10-01), Axmear et al.
patent: 4642562 (1987-02-01), Collins et al.
patent: 5262907 (1993-11-01), Duffy et al.

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