Patent ID: 7031096
Filing Date: 2006-04-18
Classification: G11B

Abstract:
1. A data storage device comprising: an actuator for supporting and moving a head for reading and writing data with respect to a recording medium; a servo control unit for feeding back a position error signal obtained by scanning the recording medium by the head to control an operation of the actuator; a notch filter for reducing a gain of a preset center frequency component from a servo signal transmitted from the servo control unit; deviation detecting means for detecting deviation of a resonance frequency of the actuator from a center frequency set in the notch filter; wherein the deviation detecting means comprises: a multiplier for multiplying the signal passed through the band-pass filter by the signal passed through the phase shifter; and changing means for changing a set value of the center frequency set in the notch filter based on a result of the deviation detection by the deviation detecting means.