Storage device, control device, control method and program

摘要

A heater (65) for changing a projection distance or protrusion value by thermal expansion accompanying electric-power-distributed heating is embedded in a head (22) having a reading element (62) and a recording element. A clearance control information measurement unit measures and saves, at desired correction timing, clearance control information including a clearance required for controlling the clearance between the reading element (62) and the recording medium (20), heater projection sensitivity or protrusion sensitivity, projection distance or protrusion value transition time, recording current projection distance or protrusion value, and a temperature correction coefficient. The clearance control unit varies the electric power distributed to the heater (65) and changes the projection distance of the head, thereby controlling the clearance (76) to a target clearance upon reproduction and recording.