Method and apparatus for rejecting contact-induced disturbances

Details Method and apparatus for rejecting contact-induced disturbances Method and apparatus for rejecting contact-induced disturbances

2007-04-17

2007-04-17

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S025000, C360S031000

Reexamination Certificate

active

11069734

ABSTRACT:
A method and apparatus for compensating for head-to-disk contact-induced disturbances in a hard disk drive is disclosed. The method includes determining topographical variations across a surface of a disk during the manufacturing or operation of the hard disk drive. Error signal variations that occur as a result of head-to-disk contact-induced disturbances resulting from the topographical variations are recorded. Current to a voice coil motor in the hard disk drive is varied to correct for the contact-induced disturbances before they occur.

REFERENCES:
patent: 6097559 (2000-08-01), Ottesen et al.
patent: 2003/0011915 (2003-01-01), Riddering et al.
“Comparison or Four Discrete-Time Repetitive Control Algorithms” Kempf et al. IEEE Control Systems 1993.
“Characterization and Compensation of Disturbances Caused by Head-Disk Contact in Hard Disk Drives” Matthew White, IFAC 2005.

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