Patent ID: 8693139

Claim:
A disk drive comprising: a hub comprising a top surface and a non-circular protrusion extending upward from the top surface, wherein a first screw hole is formed in the top surface of the hub; a disk clamp comprising a wall portion and a non-circular opening formed through the clamp, the opening configured to receive the non-circular protrusion extending upward from the top surface of the hub, wherein a second screw hole is formed through the wall portion of the disk clamp, and wherein the second screw hole formed through the disk clamp is substantially aligned with the first screw hole formed in the top surface of the hub; and at least one disk supported by the hub, wherein the non-circular protrusion extending upward from the top surface of the hub is inserted into the opening formed in the clamp, and wherein an outer annular portion of the clamp engages the disk to provide clamping force; and wherein the disk clamp further comprises: an inner lower region that contacts the top surface of the hub; an outer lower region that contacts the disk to provide the clamping force; and a raised region proximate to the second screw hole formed through the wall portion of the disk clamp, the raised region forming an air gap between the disk clamp and the hub.