The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 2010
Filed:
Apr. 28, 2005
Mitsuru Kitamura, Kanagawa, JP;
Masahiko Katoh, Kanagawa, JP;
Hitoshi Tamura, Kanagawa, JP;
Hiroaki Uchiyama, Kanagawa, JP;
Masashi Murayama, Kanagawa, JP;
Migifumi Ikeda, Kanagawa, JP;
Kazuo Sasaki, Kanagawa, JP;
Shigeki Watabe, Kanagawa, JP;
Mitsuru Kitamura, Kanagawa, JP;
Masahiko Katoh, Kanagawa, JP;
Hitoshi Tamura, Kanagawa, JP;
Hiroaki Uchiyama, Kanagawa, JP;
Masashi Murayama, Kanagawa, JP;
Migifumi Ikeda, Kanagawa, JP;
Kazuo Sasaki, Kanagawa, JP;
Shigeki Watabe, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
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.