Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-05-01
2007-05-01
Wellington, Andrea (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S078040
Reexamination Certificate
active
11250649
ABSTRACT:
Disclosed is a disk drive to characterize misaligned servo wedges. A disk of the disk drive includes a plurality of circumferential tracks, in which, each track includes a plurality of servo wedges spaced sequentially around the circumference of the track wherein the servo wedges may be misaligned relative to the head of the disk drive that moves about a pivot. A servo controller is used to characterize the misaligned servo wedges relative to the head during a seek operation by implementing the following operations: commanding the head to perform a seek operation from a starting track to an ending track; obtaining samples of wedge-to-wedge time (WTWT) values corresponding to time intervals between identified servo wedges for sampled tracks traversed during the seek operation; calculating WTWT variations for each sample; and calculating a calibrated misalignment value for each sample based upon WTWT variations.
REFERENCES:
patent: 6021012 (2000-02-01), Bang
patent: 6023386 (2000-02-01), Reed et al.
patent: 6175458 (2001-01-01), Carlson
patent: 6710957 (2004-03-01), Nakasato
patent: 6839194 (2005-01-01), Koyanagi
patent: 7075746 (2006-07-01), Kupferman
Barlow Carl E.
Chen Jenghung
Tsai Chun Sei
Wang Zhi
Blakely & Sokoloff, Taylor & Zafman
Olson Jason
Wellington Andrea
Western Digital Technologies Inc.
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