Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-02-14
2006-02-14
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
06999267
ABSTRACT:
The present invention may be embodied in a method of determining a repeatable runout (RRO) compensation value set for a data track on a magnetic disk in a disk drive. The track comprises a plurality of embedded sectors that define a circumferential path having RRO requiring compensation during data read and write operation. In the method, track following is performed along the track and a position error signal (PES) is determined for each servo sector. An RRO compensation value is iteratively learned for each servo sector using the previously learned value for the servo sector and using the PES for the servo sector and for adjacent servo sectors.
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“Median Selection of Position Error Signals in a Data Recording Disk File,” May 1987, IBM TDB vol. 29, No. 12, pp. 5239-5240.
Melkote Hemant
Wang Zhi
Fawcett, Esq. Robroy R.
Habermehl James L
Western Digital Technologies Inc.
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