Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-02-07
2006-02-07
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
06995941
ABSTRACT:
A method is disclosed for improving head position determination in a disk drive having a transducer head and a rotating disk with a plurality of embedded servo wedges for defining a plurality of concentric data tracks. Each servo wedge has a plurality of servo bursts for providing radial track position information. In the method, the servo bursts within a servo wedge are read and a burst amplitude is determined for each servo burst. The burst amplitudes are compared to determine a radial servo position zone. A fine radial head position within the radial servo position zone is determined based on a ratio having a numerator consisting of an algebraic sum and difference of the burst amplitudes and a denominator consisting of an algebraic difference between a largest burst amplitude and a smallest burst amplitude.
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Miyamura Masao
Nguyen David Dung Tien
Fawcett, Esq. Robroy R.
Tzeng Fred F.
Western Digital Technologies Inc.
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