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. 28, 2014
Filed:
Dec. 08, 2010
Kei Yasuna, Kanagawa, JP;
Tomoo Ozaki, Kanagawa, JP;
Makoto Takase, Kanagawa, JP;
Takao Horiguchi, Kanagawa, JP;
Kei Yasuna, Kanagawa, JP;
Tomoo Ozaki, Kanagawa, JP;
Makoto Takase, Kanagawa, JP;
Takao Horiguchi, Kanagawa, JP;
HGST Netherlands B.V., Amsterdam, NL;
Abstract
A system and method of writing servo write tracks to a rotating disk using a head having a read/write offset is disclosed. One embodiment utilizes a write element on the head to write the servo write tracks. A read element on the head is then positioned over the servo write tracks. The phase of a specific frequency component of the track shape error in the servo write track is measured during the positioning of the read element over the servo write track. A sine wave having a specific frequency and a phase is selected based on the measurement results. The sine wave is then applied to a servo system as a correction signal. A new servo write track is then written with the write element.