Apparatus and method for head positioning control in disk drive

Details Apparatus and method for head positioning control in disk drive Apparatus and method for head positioning control in disk drive

2005-05-10

2005-05-10

Sniezek, Andrew L. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077040, C360S078040

Reexamination Certificate

active

06891693

ABSTRACT:
A memory section stores values of the runout component, which are obtained in respective predetermined radial positions on the disk. A determining section selects, from the memory section, a value of the runout component corresponding to a target position. A runout detector uses, as an initial value for adaptive learning, the value of the runout component selected by the determining section, and calculates, by the adaptive learning, a value of the runout component contained in a position error between a head position and the target position. A feedforward controller calculates a feedforward value used to suppress the runout component calculated by the runout detector. A feedback controller calculates a feedback value from the position error. An adder generates, from the feedback value and the feedforward value, a control amount used to position the head in the target position.

REFERENCES:
patent: 6002540 (1999-12-01), Cunningham et al.
patent: 11-39814 (1999-02-01), None
U.S. patent application Ser. No. 09/115,592, Yatsu, filed Jul. 15, 1998.

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