A method of reducing the effect of vibrations associated with seek
operations is disclosed. A feedforward filter is adjusted. A cancellation
signal is then generated utilizing an adjusted feedforward filter,
wherein the cancellation signal models a resonance of a vibration mode.
The cancellation signal is provided at an actuator control signal,
thereby inducing a force applied to an actuator such that the force holds
the actuator at a track center position while vibrations occur during
hard disk drive operations.