Patent ID: 7450338

Claim:
A hard disk drive comprising: a housing including a base and a cover connected to the base; a spindle motor connected to the base; a disk mounted to the spindle motor and rotating with respect to the base; an actuator rotatably connected to the base and including a slider supported by the actuator and a magnetic head mounted on a front end of the slider, the magnetic head writing and/or reading data to and/or from the disk; and a plurality of blades protruding from at least one of a surface of the base or a portion of the cover facing the disk, and guiding an air flow, caused by rotation of the disk, toward an outer edge of the disk, wherein a side surface of the blade on which the air flow caused by the rotation of the disk is incident is inclined to guide the air flow to a surface of the disk; wherein the blades are spiral-shaped in a direction opposite to rotation of the disk.