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:
Jul. 14, 2009
Filed:
Oct. 16, 2006
Takuya Kamimura, Kawasaki, JP;
Koji Matsumoto, Kawasaki, JP;
Takeshi Morikawa, Kawasaki, JP;
Shingo Hamaguchi, Kawasaki, JP;
Yukio Hirai, Kawasaki, JP;
Takuya Kamimura, Kawasaki, JP;
Koji Matsumoto, Kawasaki, JP;
Takeshi Morikawa, Kawasaki, JP;
Shingo Hamaguchi, Kawasaki, JP;
Yukio Hirai, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A magnetic recording medium includes a substrate and a recording layer formed on the substrate. The recording layer is provided with a plurality of information tracks each having a track servo signal region and a user data region. Adjacent information tracks are separated by non-magnetic material. The track servo signal region includes a plurality of magnetic portions arranged in a track-extending direction and non-magnetic portions interposed between the magnetic portions. The user data region includes magnetic portions arranged in the track-extending direction. The coercive force of the magnetic portions in the track servo signal region is different from that of the magnetic portions in the user data region. For instance, the former coercive force is weaker than the latter coercive force.