Patent ID: 6982848

Claim:
A disk apparatus, comprising: an actuator including a voice coil motor, an arm provided to the voice coil motor, and a head attached to the arm for recording and/or reproducing information; driving means for driving the actuator, the driving means receiving a driving signal used for driving the actuator and a pseudo disturbance signal that simulates disturbance applied to the actuator; a voltage detection means for detecting a voltage induced in the voice coil motor by the driving of the actuator to output a first voltage signal which corresponds to the detected voltage; voltage signal adjustment means for outputting the pseudo disturbance signal, receiving the driving signal, a disturbance estimation signal that estimates disturbance, and the first voltage signal, and adjusting the first voltage signal such that a deviation of a coil resistance of the voice coil motor from a nominal value is corrected except for the times of recording and reproduction of the information, thereby generating a second voltage signal; and disturbance estimation means for estimating the magnitude of the disturbance applied to the actuator from the driving signal and the second voltage signal to generate the disturbance estimation signal.