Patent ID: 11862193
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A magnetic disk device comprising:
an actuator;
a controller that controls the actuator;
a loop shaping filter connected in parallel with the controller, the loop shaping filter having a parameter for suppressing a rotation asynchronous disturbance affecting the actuator, the parameter of the loop shaping filter being determined using a transfer function from an output of the loop shaping filter to before an input of the rotation asynchronous disturbance; and
a notch filter that suppresses mechanical resonance of the actuator, wherein
a parameter of the notch filter is changed according to a change in the actuator, and simultaneously the loop shaping filter is redesigned by reflecting a change in the transfer function.