Patent ID: 9691420
Date: 2017-06-27
CPC Classifications: G11B

Claim:
1. A disc device comprising: a head for writing and reading data relative to a disc; an actuator to move the head over a disc surface of the disc; and a processor to include a comparison unit to determine a position error between a control position and a target position of the head to the disc surface; a controller to output to the actuator an operation amount for decreasing the position error; a first filter to output a first signal for canceling out a first disturbance at a predetermined frequency of the position error; a second filter to output a second signal which gain or phase of the first signal are changed and being expressed as a second transfer function in which the gain or phase of the first signal are changed by gain or phase of inverse characteristics of a first transfer function including the first disturbance; and a correction unit to correct the operation amount or the position error by using the second signal.