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. 15, 2009
Filed:
Mar. 14, 2007
Reed D. Hanson, Chaska, MN (US);
Thomas C. Zirps, Minneapolis, MN (US);
Peng Yan, Bloomington, MN (US);
Samir Mittal, Eden Prairie, MN (US);
Timothy F. Ellis, Tonka Bay, MN (US);
Reed D. Hanson, Chaska, MN (US);
Thomas C. Zirps, Minneapolis, MN (US);
Peng Yan, Bloomington, MN (US);
Samir Mittal, Eden Prairie, MN (US);
Timothy F. Ellis, Tonka Bay, MN (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
Compensation for repeated runout (RRO) error, such as in a data storage device servo circuit, is preferably carried out by obtaining a population distribution of RRO error values from at least selected ones of a subset of tracks. An RRO error compensation value is determined for each one of the subset of tracks when a variance characteristic of said population distribution meets a selected criterion. Preferably, a first track of a storage medium has a servo field at a first angular position on the medium, a repeated runout (RRO) error compensation field at a second angular position on the medium, and a user data field at a third angular position on the medium. An immediately adjacent second track preferably has a servo field at the first angular position and a user data field at the second angular position in lieu of an RRO error compensation field.