▎ 摘　　要

NOVELTY - Hard disk drive comprises a base, a top cover coupled to the base, a process cover coupled to the base to create an enclosure and positioned between the base and the top cover, and an actuator assembly positioned in the enclosure and including a body and only 12 arms extending from the body. The body and the arm comprises a carbon-reinforced material, the arms each having a thickness of 0.58-0.71 mm. The hard disk drive is a 3.5" form factor hard disk drive having an overall external height of 25-26.1 mm and that is filled with a target gas comprising helium. USE - Hard disk drive. ADVANTAGE - The hard disk drives can create additional space for additional magnetic recording media, and reduce thickness of each arm and disk spacer. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective exploded view of a hard disk drive. 102Base deck 104Process cover 106Top cover 114Disk clamp 116Actuator assembly