Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-03-27
2007-03-27
Wellington, Andrea (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S077010
Reexamination Certificate
active
11153153
ABSTRACT:
A disk drive is disclosed having a servo control system optimized for faster determination of repeatable runout (RRO) correction values. Each circumferential track on a magnetic disk exhibits total runout having an RRO component and a nonrepeatable runout (NRO) component. The control system generates a control signal for positioning a transducer head during a track following operation based on distributed position information defining the followed track. PES values are calculated based on the distributed servo position information read during a track following operation. The first servo-loop compensator processes the PES values during normal data access operations and has a first transfer function that is optimized with respect to a variance of the total runout. The second servo-loop compensator processes the PES values during a RRO calibration operation and has a second transfer function that is optimized with respect to a variance of the NRO component.
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Melkote Hemant
Yi Li
Fawcett, Esq. Robroy R.
Olson Jason
Prejean, Esq. Jonathan E.
Wellington Andrea
Western Digital Technologies Inc.
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