Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-04-11
2006-04-11
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S077040
Reexamination Certificate
active
07027256
ABSTRACT:
A magnetic disk drive having a reduction in repeatable runout (RRO) effects is disclosed. The disk drive has a head disk assembly (HDA) and a sampled servo controller. The HDA includes a rotating magnetic disk, an actuator, and a transducer head. The magnetic disk has a plurality of embedded servo sectors for storing servo information including repeatable runout (RRO) cancellation values and RRO cancellation value error correction code (ECC) data at a servo data rate. The RRO cancellation value ECC data is only for detecting and correcting errors in the RRO cancellation values. In between the embedded servo sectors are data sectors for storing user data at a user data rate that is different from the servo data rate. The actuator positions the transducer head in response to a control effort signal generated by the sampled servo controller based on the servo information.
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Chue Jack M.
McNab Robert J.
Subrahmanyam Jai N.
Fawcett, Esq. Robroy R.
Hudspeth David
Olson Jason
Prejean, Esq. Jonathan E.
Western Digital Technologies Inc.
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