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. 11, 2018
Filed:
Mar. 09, 2017
Applicant:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Inventor:
Anton Gerasimov, Santa Clara, CA (US);
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 20/02 (2006.01); G11B 5/596 (2006.01); G11B 5/02 (2006.01); G11B 20/18 (2006.01);
U.S. Cl.
CPC ...
G11B 5/59661 (2013.01); G11B 5/02 (2013.01); G11B 5/59638 (2013.01); G11B 20/18 (2013.01);
Abstract
During in-drive writing of a servo spiral on a disk surface, a servo spiral can be distinguished during demodulation from adjacent servo spirals on the same disk surface. When a set of servo spirals is written on a disk surface, a first spiral is written to include a first identifying characteristic and the following spiral is written to include a second identifying characteristic. The identifying characteristic may include embedded sync marks encoding a certain numerical value, a unique frequency of high-low transitions included in each spiral, and/or a unique frame size.