A hard disk drive having a housing with a base and a cover connected to
each other, a spindle motor connected to the base, a disk mounted on the
spindle motor and rotating with respect to the base, and an actuator
rotatably connected to the base and supporting a slider with a magnetic
head mounted on a front end thereof. The magnetic head writes and/or
reads data to and/or from the disk. The hard disk drive also has a blade
protruding from a surface of the base and/or a portion of the cover
facing the disk. The blade guides an air flow caused by rotation of the
disk toward an outer edge of the disk.