Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1990-03-06
1993-10-12
Smith, Jerry
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 49, 360 722, 360 7705, 369 43, 369 4426, G11B 2732, G11B 2730
Patent
active
052531317
ABSTRACT:
A servo pattern which provides for reference clock synchronization, track following and track crossing, and radial and angular head position information, is described. On each servo track, no two locations have the same pattern, and on each servo track, the pattern read is different from the pattern read on any other servo track. Off-track error signals are derived from the relative read signal amplitudes of adjacent track patterns and reference clock synchronization is derived from the timing of the pulses read. During drive operation, the pattern read from a servo track is compared to an identical pattern generated electronically. Radial and angular position can then be known with certainty when the two patterns match within predetermined bounds. The present invention allows all pulses in the pattern to be used for reference clock synchronization, track following and seeking, and radial and angular position acquisition.
REFERENCES:
patent: 4604725 (1986-08-01), Davies et al.
patent: 4918677 (1990-04-01), Ashinuma et al.
Garland Steven R.
Maxtor Corporation
Smith Jerry
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