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:
Oct. 14, 2014
Filed:
Aug. 02, 2011
Mao Nishiyama, Yamato, JP;
Masafumi Mochizuki, Chigasaki, JP;
Kyo Akagi, Fuchu, JP;
Shuji Nishida, Fujisawa, JP;
Kazunari Usui, Fujisawa, JP;
Mao Nishiyama, Yamato, JP;
Masafumi Mochizuki, Chigasaki, JP;
Kyo Akagi, Fuchu, JP;
Shuji Nishida, Fujisawa, JP;
Kazunari Usui, Fujisawa, JP;
HGST Netherlands B.V., Amsterdam, NL;
Abstract
In one embodiment, a method includes spiral writing a DC pattern onto a magnetic disk medium using a writer of a magnetic head while moving the magnetic head in a direction about parallel to a radial direction of the magnetic disk medium while rotating the magnetic disk medium, reading the magnetic disk medium while moving the magnetic head in the direction about parallel to the radial direction of the magnetic disk medium while rotating the magnetic disk medium, and calculating a track pitch interval between data tracks of the magnetic disk medium based on the reading of the magnetic disk medium. In another embodiment, a magnetic disk medium includes a DC spiral pattern in a radial region further outward and/or a radial region further inward than a radial region where data is recorded.