Method for resonance identification in hard disk drives

Details Method for resonance identification in hard disk drives Method for resonance identification in hard disk drives

2007-01-02

2007-01-02

Nguyen, Hoa T. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

11096556

ABSTRACT:
A hard disk drive that redefines a notch filter of the drive. The update process may include initially disabling all notch filters and inducing a seek operation of the disk drive heads. A position error signal is read during a settling time of the seek operation and processed to determine the frequency of the signal. The frequency is selected as a resonant frequency if the error signal magnitude exceeds a threshold value. The notch filter is then redefined in accordance with the selected resonant frequency. The controller may also perform a routine to determine whether the resonant frequency is above or below a Nyquist frequency. Unlike prior art techniques, the method disclosed can obtain the resonant frequency without sweeping the excitation signal of the disk drive voice coil motor.

REFERENCES:
patent: 6643080 (2003-11-01), Goodner et al.
patent: 6690534 (2004-02-01), Ding et al.
patent: 2003/0058558 (2003-03-01), Ottesen et al.

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