Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data verification
Reexamination Certificate
2005-11-17
2009-08-11
Nguyen, Hoa T (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data verification
C360S031000, C360S048000, C360S075000, C360S077020, C360S078040
Reexamination Certificate
active
07573667
ABSTRACT:
Embodiments of the invention provide a servo information write method that makes it possible to properly locate the last-written servo information even when old servo information is overwritten by new servo information. In one embodiment, a servo track writer controller, which is within a servo track writer, reads a serial number (S/N) from a HDD (step101), and acquires a magnetic disk drive servo information write count (P-ID) from a manufacturing process host (step102). The next step (step103) is then performed to control a positioner and a read/write channel so as to start writing servo information onto a magnetic disk. Servo information is sequentially written until the last track is written into (step104). When the Nth servo information is to be written, a P-ID (N) is written subsequently to a burst signal (step105). When the last track is written into in step104, step106is performed to notify the manufacturing process host that the Nth servo information write is performed. Then, the servo information write process ends.
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Duncan Patrick
Hitachi Global Storage Technologies - Netherlands B.V.
Mercedes Dismery E
Nguyen Hoa T
Townsend and Townsend / and Crew LLP
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