Clamping device for a rotatable component of a machine including a balance hole configured to confine a counterweight

A disk clamp for coupling a magnetic-recording disk with a spindle of a hard-disk drive, including a balance hole configured to confine a counterweight, said disk clamp comprising:

• a circular plate, said circular plate comprising:
• a plurality of fastener holes configured to accept a plurality of fasteners, said fasteners configured to fasten said disk clamp to couple said magnetic-recording disk with said spindle;
• and
• a plurality of balance holes configured to accept a plurality of counterweights, a balance hole of said plurality of balance holes comprising:
• a cavity configured to accept a counterweight, said counterweight configured to balance rotational motion of at least said circular plate when said spindle is rotated;
• wherein said cavity is configured to confine said counterweight to an end of said cavity by effects of rotation of said spindle on said counterweight when said spindle is rotated.

A hard-disk drive, comprising:

• a spindle;
• at least one magnetic-recording disk;
• at least one magnetic-recording head disposed to read data from, and to write data to, said magnetic-recording disk;
• and
• a disk clamp, said disk clamp configured to couple said magnetic-recording disk with said spindle, including a balance hole configured to confine a counterweight, said disk clamp comprising:
• a circular plate, said circular plate comprising:
• a plurality of fastener holes configured to accept a plurality of fasteners,
• said fasteners configured to fasten said disk clamp to couple said magnetic-recording disk with said spindle;
• and
• a plurality of balance holes configured to accept a plurality of counterweights, a balance hole of said plurality of balance holes comprising:
• a cavity configured to accept a counterweight, said counterweight configured to balance rotational motion of at least said circular plate when said spindle is rotated;
• wherein said cavity is configured to confine said counterweight to an end of said cavity by effects of rotation of said spindle on said counterweight when said spindle is rotated.