Patent ID: 7630171

Claim:
A hard disk drive having a balance weight to compensate for an imbalance in the disk stack assembly comprising: a disk stack assembly comprising at least one disk, a spindle motor adapted to rotate the disk and comprising a rotational shaft and a spindle motor hub adapted to support the disk, a clamp comprising a plurality of installation holes, wherein the clamp has an annular shape including a removed section, and at least one clamp screw coupled to one of the plurality of installation holes, and coupled to the spindle motor hub to fix the disk to the spindle motor hub by elastically pressing the disk between the clamp and the spindle motor hub; and, the balance weight integrally coupled to the clamp and configured to compensate for an imbalance in the disk stack assembly, wherein the balance weight is peripherally coupled to the clamp outside of the plurality of installation holes and shaped to fill the removed section of the clamp.