Fujitsu Corporation

Terushige Arai

Keiji Aruga

Tsuneyori Ino

Hiroyuki Iwahara

Mitsuaki Yoshida

Kazunori Tochiyama

Masanori Fukushi

Toshiya Kato

Yasuhiro Miura

Yasuyoshi Asao

The method of positioning a disk-shaped medium is capable of precisely positioning the center of the disk-shape medium with respect to a center of a rotary shaft. The method comprises the steps of: inserting a cylindrical hub into a center hole of the disk-shaped medium; and covering a hub adaptor, which is eccentrically fixed to a rotary shaft, with the hub so as to position the disk-shaped medium on the rotary shaft. Directions of eccentricity of the disk-shaped medium, the hub and a hub unit are defined on the basis of amount of eccentricity between the disk-shaped medium and the hub, that between the hub and the hub adaptor and that between the hub adaptor and the rotary shaft.

Method of positioning disk-shaped medium

A disk device has a housing structure capable of reducing unnecessary vibrations of the base of the disk device by improving the rigidity thereof. A bath-tub type base of the disk device includes a damping structure on the bottom or on the sides adjacent to the bottom for attenuating the vibrations of the base. Apparatus for writing a reference signal into the disk of the device using a reference head with a head insertion hole formed in the base is also provided.

Disk device and apparatus for writing reference signal into the device

Growing community of inventors

Kawasaki, Japan

Terushige Arai