Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2006-06-06
2006-06-06
Young, Wayne (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
C360S048000, C360S077040
Reexamination Certificate
active
07057836
ABSTRACT:
A disk drive includes a moveable head and a disk having a circumferential track which includes a plurality of servo wedges. The servo wedges are spaced sequentially around a circumference of the circumferential track. Each servo wedge includes an extended servo header. The disk drive includes a servo controller to perform track following with the moveable head. The servo controller compensates for servo wedge timing errors due to eccentricity associated with the servo wedges of the circumferential track by implementing: a first mode in which the servo controller locks to the extended servo header of a servo wedge and performs servo wedge timing error learning to characterize servo wedge timing errors and a second mode to adapt servo control signals of the servo controller based on the characterized servo wedge timing errors of the first mode in order to dynamically compensate for the eccentricity associated with the servo wedges.
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Blakely & Sokoloff, Taylor & Zafman
Mercedes Dismery
Western Digital Technologies Inc.
Young Wayne
LandOfFree
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