Hitachi Global Storage Technologies Netherlands B.v.

Migifumi Ikeda

Kazuo Sasaki

Hiroaki Uchiyama

Masahiko Katoh

Hitoshi Tamura

Mitsuru Kitamura

Masashi Murayama

Shigeki Watabe

Embodiments of the invention prevent a spindle motor from stopping rotation while data on a magnetic disk is being erased by using a permanent magnet. In one embodiment, data in the whole area of the magnetic disk is erased as a consequence of the magnetic disk rotating in the magnetic field of the permanent magnet located so as to face a part of the magnetic disk. A back yoke is located so as to face a base. The back yoke gives a magnetic force to the spindle motor in the opposite direction of the magnetic force of the erasing permanent magnet so that the fluid dynamic bearing spindle motor can retain the rotation as required without stopping rotation.

Data erasure apparatus and data erasure method

Growing community of inventors

Kanagawa, Japan

Migifumi Ikeda