Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-07-31
2007-07-31
Tzeng, Fred F. (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
10136229
ABSTRACT:
The present invention recognizes that induced RRO is coherent, i.e., the RRO has a large degree of repeatability from track to track. The present invention is a zero acceleration profile (compensation) process that targets CRRO (Coherent RRO). A process of the present invention represents a considerable reduction in the factory calibration time compared to other compensation techniques currently used. The reduction in time is attributed to the fact that CRRO can be computed by averaging position error signals (PES) over multiple tracks as opposed to total RRO which is computed by averaging over multiple revolutions on the same track.
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Seagate Technology LLC, “Compression and Storage of Written-In Error Compensation Tables In An Embedded Servo Disc Drive,” U.S. Appl. No. 09/781,363, p. 33, filed Feb. 12, 2001.
Hanson Reed David
Morris John Christopher
Zirps Thomas Christopher
Seagate Technology LLC
Tzeng Fred F.
Westman Champlin & Kelly
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