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:
Sep. 20, 2011
Filed:
Aug. 21, 2009
Masaki Yoshioka, Kanagawa, JP;
Kei Yasuna, Kanagawa, JP;
Makoto Takase, Kanagawa, JP;
Ryohheita Hattori, Kanagawa, JP;
Masaki Yoshioka, Kanagawa, JP;
Kei Yasuna, Kanagawa, JP;
Makoto Takase, Kanagawa, JP;
Ryohheita Hattori, Kanagawa, JP;
Hitachi Global Storage Technologies, Netherlands B.V., Amsterdam, NL;
Abstract
A method for writing servo sector sets that include a plurality of separate servo sectors on a disk so that servo sectors are present at same circumferential positions but different radial positions. The method includes reading a first servo sector set in a track with a read element such that the track includes first, second and third servo sector sets. The method also includes writing the third servo sector set with a write element at a different radial position from the read element with positional control and timing control using the first servo sector set while skipping the second servo sector set if all servo sectors of the first servo sector set are non-defective. Moreover, the method includes using positional control and timing control using the second servo sector set in the writing of the third servo sector set if the first servo sector set includes a defective servo sector.