Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2005-12-05
2009-08-04
Nguyen, Hoa T (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
C360S031000, C360S075000, C360S076000, C360S078040
Reexamination Certificate
active
07570446
ABSTRACT:
Embodiments of the invention provide a magnetic disk drive and its control method capable of effectively using the unrecordable area which is caused due to the composite magnetic head's gap between the read head and the write head. In one embodiment, a disk drive comprises a composite magnetic head structured in such a manner that during write the write head WH reaches each servo area earlier than the read head RH, and a read write control unit to control the write and read done by the composite magnetic head. On the disk, common servo data SP to be used both during read and during write, write servo data SW to be used during write and read servo data SR to be used during read are recorded in this order in each servo area. During write, the read write control unit starts the write head recording data at the timing when reading write servo data SW from the servo area is completed.
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Kitamura Nobuhito
Yoshida Hitoshi
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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