PURPOSE: To efficiently polish the contact surface of a contact pad.

CONSTITUTION: A stopper 3 or 4 is forcibly strained by controlling a head 1 for writing or reading out data on or from a disk medium 7 by coming into contact with the surface of the medium, the stoppers 3 and 4 constituted of an elastic material to restrict the moving range of an actuator 2 for transporting the head 1 and a motor 5 driving an actuator 2. A disk device has a control means 6 for moving the head 1 outside the moving range and the disk medium 7 provided with a region 8 and/or 9 for polishing the head 1 outside the moving range on the inner peripheral side and/or outer peripheral side of the disk medium 7 surface. The head 1 is moved to the inside of the region 8 or 9 for polishing the head 1 and the contact pad forming the part of the head 1 in contact with the disk medium 7 surface is polished.