Data storage apparatus and disk fixing method for preventing the deformation of disks by regulating where the storage apparatus is fixed to the disk

摘要

A disk drive apparatus comprises a disk for recording data and a drive motor for rotating the disk. The disk has obverse and reverse sides, a center hole, an unlevel portion with an uneven flatness on the obverse and reverse sides, situated around the center hole, and a level portion situated outside the unlevel portion and having level surfaces on the obverse and reverse sides. The disk is mounted on a hub of the motor such that the hub is passed through the center hole. The hub has at its one end a supporting portion facing the level portion of the disk. A disk retainer, having a press portion facing the level portion of the disk, is attached to the other end of the hub so as to press the disk toward the supporting portion.