Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-11-15
2005-11-15
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S051000
Reexamination Certificate
active
06965489
ABSTRACT:
A method of writing product servo sectors to a disk of a disk drive is disclosed. An external spiral servo writer writes a plurality of reference servo sectors at an outer diameter of the disk and a plurality of spiral tracks that spiral from an outer diameter to an inner diameter of the disk. At the beginning of the product servo writing process, the reference servo sectors are demodulated to initially synchronize a servo write clock. The spiral tracks are then demodulated to maintain synchronization of the servo write clock as well as maintain the head along a target circumferential path while writing product servo sectors to the disk.
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Cloke Robert L.
Lee Tehri S.
Weerasooriya Siri S.
Hudspeth David
Shara, Esq. Milad G.
Sheerin, Esq. Howard H.
Slavitt Mitchell
Western Digital Technologies Inc.
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