Patent ID: 7733601

Claim:
A hard disk drive base comprising: a plurality of contact surfaces to which a lower yoke of a voice coil motor is to be fixed; and thin portions each formed around a respective one of said plurality of contact surfaces and having a thickness smaller than a thickness of other portions of said base, wherein said plurality of contact surfaces include: a first contact surface formed around a positioning hole such that the first contact surface protrudes a first predetermined height, said first contact surface being in contact with said lower yoke, said positioning hole being engaged with a projection of said lower yoke; and a second contact surface formed around a through hole such that the second contact surface protrudes a second predetermined height, said second contact surface being in contact with said lower yoke, said through hole receiving a clamping screw therethrough with which said lower yoke is fixed to said base, wherein said thin portions include: a first thin portion formed around said first contact surface such that the first thin portion has a ring shape concentric with said positioning hole, said first thin portion having a thickness smaller than the thickness of said other portions of said base; and a second thin portion formed around said second contact surface such that the second thin portion has a ring shape concentric with said through hole, said second thin portion having a thickness smaller than the thickness of said other portions of said base.