Patent ID: 6417983
Filing Date: 2002-07-09
Classification: G11B

Abstract:
A system for positioning a head in a target position on a disk in a disk drive, said system comprising:a determining device computationally determining the position error of the position of a head of a disk drive from a target position by means of servo data recorded on a disk; a first control device computationally determining a first control value for positioning said head at said target position on the basis of said position error; a disturbance generating device generating a disturbance and adding the disturbance with a predetermined frequency different from revolutions per unit time of said disk to said position error; a second control device detecting a positional eccentric factor synchronized with a revolution of said disk from said position error including said disturbance and determining a second control value for removing the positional eccentric factor from said position error; and a third control device controlling and positioning said head at said target position, using a control value obtained by adding said first control value and said second control value.