Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-08-12
2008-03-18
Korzuch, William (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S075000
Reexamination Certificate
active
07345842
ABSTRACT:
A system for reducing written-in high-frequency repeatable run-out track mis-registration occurring during writing of servo information onto a hard disk implementable in a hard disk drive is described. The system includes an excitation frequency adjuster enabled to adjust excitation frequencies away from mechanical modes to provide desired rotation speed of a servo track writer. The mechanical modes are present in said hard disk drive. The system also includes an excitation level adjuster enabled to adjust excitation level to provide a desired DC gain level associated with a motor controller of the servo track writer. The system further includes an excitation frequency content adjuster enabled to adjust excitation frequency content to provide desired current profile of the motor controller, such that a reduction of written-in high frequency repeatable run-out track mis-registration is realized.
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Chang Jen-Yuan
Gimenez Christopher A.
Harshberger, Jr. Robert P.
Shen Jr-Yi
Hitachi Global Storage Technologies - Netherlands B.V.
Korzuch William
Olson Jason
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