Patent ID: 7110213

Claim:
A positioner that performs a seek operation of positioning a head attached to an actuator at an intended position on a disk, the positioner comprising: a drive current calculating unit that calculates a drive current which when applied to the actuator causes the actuator to move the head to the intended position; a drive current adjusting unit that adjusts the calculated drive current based on a speed of the head and a difference between a true position of the head and an intended position during a previous seek operation; and an actuator moving unit that moves the actuator based on the adjusted drive current so as to move the head to the intended position wherein: the drive current includes an acceleration current that accelerates the actuator, and a retardation current that retards the actuator, and the drive current adjusting unit decreases a proportion of the acceleration current in the drive current if the head had crossed the intended position in the previous seek operation, and increases a proportion of the acceleration current in the drive current if the head had fallen short of the intended position in the previous seek operation.