Patent ID: 7027261

Claim:
A disk apparatus comprising: a disk which stores information; a clamp which has a central hole; a spindle hub which is equipped with the disk, has a boss that fits into the clamp and allows a rotating center axis of the spindle hub to coincide with a center axis of the clamp; a screw which has a thread section and a head section, said thread section passing the central hole of the clamp and being tightened to the spindle hub, and said head section coming in contact with the clamp and providing the clamp with an axial force generated when the thread section is tightened to the spindle hub, to fix the disk to the spindle hub; and a spindle motor which rotates the spindle hub, wherein the clamp is displaced in a direction of the axial force at a first portion thereof positioned radially inwardly of a contact region where the clamp and the head section are held in contact with each other.