Patent ID: 6961211

Claim:
A disk drive apparatus comprising: a case: a motor having a rotatable hub and being attached to the case; a disk having an inner hole through which the hub is inserted, the disk being fitted on an outer periphery of the hub; and a disk clamper fixed to an end portion of the hub to hold the disk on the hub, the disk clamper including a clamp portion fixed to the end portion of the hub and being constructed and arranged to hold a center portion of the disk, the disk clamper also including an annular straightening portion extending outwards from the clamp portion in a radial direction, facing a surface of the disk, being distanced from the surface of the disk by a predetermined gap, and being formed integrally with the clamp portion, wherein an outer diameter of the straightening portion of the disk clamper is 50 to 110% of that of the disk.