Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2008-12-05
2010-11-23
Wong, K. (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S078040
Reexamination Certificate
active
07839596
ABSTRACT:
A method for controlling the effects of seek-induced vibration of a component part in a hard-disk drive. The method includes determining a resonant frequency of seek-induced vibration of the component part and a reference amplitude of a frequency-component in a first voice-coil-motor signal (VCMS) at the resonant frequency. The method also includes synthesizing a second VCMS with an amplitude of a frequency-component attenuated below the reference amplitude of the frequency-component in the first VCMS at a frequency in a resonance-band bracketing the resonant frequency. The method also includes driving a voice-coil of a voice-coil motor with the second VCMS to reduce an amplitude of a frequency-component at the resonant frequency in a second PES of the seek of the data track associated with the second VCMS below a reference amplitude of a frequency-component at the resonant frequency in the first PES associated with the first VCMS.
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Shen Jr-Yi
Wang Zhi
Hitachi Global Storage Technologies - Netherlands B.V.
Wong K.
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