Patent ID: 7286320

Claim:
A hard disk drive comprising: a housing comprising a base plate and a cover plate provided with a through hole; a spindle motor comprising a shaft which is supported on the base plate and the upper end of which is joined to the cover plate by a screw inserted through the through hole, and a hub installed around the outer circumference of the shaft to be rotatable; at least one data storage disk joined to the outside of the hub and capable of being rotated together with the hub; a head assembly for recording data onto the disk and reading recorded data from the disk; a damper which is interposed between the screw and the cover plate, the damper comprising at least one viscoelastic material layer, wherein the head portion of the screw and the through hole are tapered, such that the diameters thereof become smaller toward the shaft, and wherein the damper is tapered to have an outer truncated cone shape, thereby contacting the outer circumferential surface of the head portion of the screw and the inner circumferential surface of the through hole while being interposed therebetween.