Disk drive and manufacturing method thereof

A manufacturing method of a disk drive device comprising:

• arranging a disk, a motor for rotating the disk, a head for accessing the disk, and a moving mechanism for supporting and moving the head in a base;
• joining a cover to the base and forming an enclosure for enclosing the disk, the motor, the head, and the moving mechanism;
• and
• injecting low-density gas which has lower-density than air through an injection hole formed on the enclosure as emitting air in the enclosure through an emission hole formed on the enclosure in a state that the motor is rotating the disk, air current at the injection hole caused by the disk rotation being faster than air current at the emission hole in the enclosure.

A manufacturing method of a disk drive device comprising:

• arranging a disk, a motor for rotating the disk, a head for accessing the disk, and a moving mechanism for supporting and moving the head in a base;
• joining a cover to the base and forming an enclosure for housing the disk, the motor, and the moving mechanism;
• and
• injecting low-density gas which has lower density than air through an injection hole on the cover to which a valve filter is attached as emitting air in the enclosure through an emission hole on the cover in a state that the motor is rotating the disk, the valve filter being in an open state if an inside pressure of the enclosure is lower than an outside pressure and closing the hole if the inside pressure of the enclosure is higher than the outside pressure.