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:
Nov. 07, 2006
Filed:
Aug. 12, 2005
Jen-yuan Chang, San Jose, CA (US);
Christopher A. Gimenez, San Jose, CA (US);
Robert P. Harshberger, Jr., San Jose, CA (US);
Jr-yi Shen, Sunnyvale, CA (US);
Jen-Yuan Chang, San Jose, CA (US);
Christopher A. Gimenez, San Jose, CA (US);
Robert P. Harshberger, Jr., San Jose, CA (US);
Jr-Yi Shen, Sunnyvale, CA (US);
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
A method for reducing written-in high frequency repeatable run out track mis-registration of a hard disk is described. The method includes adjusting the excitation frequencies away from mechanical modes to provide desired rotating speed of a servo track writer. The mechanical modes are relative to said hard disk drive. The method further includes adjusting excitation levels to provide desired DC gain level associated with a motor controller of the servo track writer, wherein instances of the written-in high frequency repeatable run out track mis-registration are reduced.