Patent ID: 7961426

Claim:
A disk device comprising: a base including a bottom wall; a motor provided on the base; a disk-shaped recording medium rotatably supported on the motor and opposed to the bottom wall of the base; a head which performs information processing for the recording medium; and a head actuator which is rotatably mounted on the base and supports the head for movement with respect to the recording medium, the bottom wall of the base including a recess provided opposite a movement region for the head actuator and a first step portion and a second step portion which individually extend from the vicinities of the motor to the vicinities of an outer peripheral edge of the recording medium and define the recess, wherein the first step portion on the side of a center of rotation of the head actuator comprises an outer end that faces the outer peripheral edge of the recording medium and an outer peripheral portion that extends from the outer end toward an end near the motor, and wherein the outer peripheral portion is located on the opposite side of the head actuator with respect to a line which connects the outer end of the first step portion and a center of rotation of the recording medium.