Patent ID: 8018673

Claim:
A disk drive comprising: a plurality of head-sliders each comprising a slider and a magnetic-recording head on said slider for accessing a disk for storing data; an actuator to which said plurality of head-sliders are secured for moving said plurality of head-sliders concurrently; a plurality of clearance adjustment sections each corresponding to each head-slider of said plurality of head-sliders and configured to adjust a clearance of said corresponding head-slider; and a controller for positioning said actuator by servo control with at least two head-sliders selected from said plurality of head-sliders, for changing a clearance of a third head-slider different from said at least two head-sliders by controlling a clearance adjustment section of said third head-slider to bring said third head-slider into contact with a disk, and for detecting said contact to measure said clearance of said third head-slider.