Patent ID: 7209320

Claim:
In a rotating disc drive assembly having a powered hub, which rotates a flat, annular disc, a clamp being used to fasten the disc to the powered hub via connecting fasteners, an improvement comprising: said clamp having a generally annular shape with a peripheral contact surface which faces downward against an upper surface of the disc; said peripheral contact surface having a straight line segment along a radius from a center of the hub; said straight line segment starting from an inner edge to an outer edge of the peripheral contact surface; said straight line segment further comprising a taper starting from the outer edge upward toward the inner edge; and wherein when the fastener is fastened a force emanating from the fastener outbound to the outer edge of the peripheral contact surface causes the clamp to distort downward from the inner edge to the outer edge of the peripheral contact surface so as to force the inner edge in contact with the upper surface of the disc, thereby distributing the downward force on the fastener along an entire length of the straight line segment.