Patent ID: 7057852

Claim:
A disk drive comprising: a disk drive base; a rotatable disk including a disk surface; a spindle motor rotatably coupled to the disk drive base for rotating the disk about an axis of rotation, the spindle motor including a spindle motor hub including a clamping surface with a plurality of threaded disk clamp holes; a disk clamp disposed upon the disk surface about the spindle motor hub, the disk clamp including a screw head interface surface and a plurality of screw openings formed through the disk clamp; and a plurality of disk clamp screws, the screws each including a shaft sized and configured to respectively engage the threaded disk clamp holes respectively through the screw openings, the screws each further including a screw head having a screw head clamping surface disposed against the screw head interface surface, the screws each further including a solid surface coating disposed upon the screw head clamping surface, the surface coating having a static coefficient of friction less than a static coefficient of friction of the screw head for mitigating relative movement between the disk clamp and the axis of rotation of the spindle motor.