Patent ID: 6754031
Filing Date: 2004-06-22
Classification: G11B

Abstract:
A servo apparatus having an access mechanism, wherein said servo apparatus is driven by a voice coil motor to follow a target position of a disk within a disk drive, said servo apparatus comprising:a first detector for detecting a displacement value of said access mechanism from a target position at predetermined time intervals; a first feedback means for calculating a first feedback value on the basis of said displacement value; a second detector for detecting a physical value, including a speed of the access mechanism, at least once in each of the predetermined time intervals, wherein said second detector also detects a voltage generated in said motor; a second feedback means for calculating a second feedback value on the basis of said physical value; and a motor driver for driving said motor according to said first feedback value and said second feedback value, wherein said motor driver controls a driving current of said motor according to said first feedback value and said second feedback value.