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. 04, 2005
Filed:
Dec. 08, 2000
Brian Pollock, Eden Prairie, MN (US);
Alexei H. Sacks, Edina, MN (US);
Brian Sudman, Eden Prairie, MN (US);
James H. Mcglennen, Eden Prairie, MN (US);
Reed D. Hanson, Chaska, MN (US);
Brian Pollock, Eden Prairie, MN (US);
Alexei H. Sacks, Edina, MN (US);
Brian Sudman, Eden Prairie, MN (US);
James H. McGlennen, Eden Prairie, MN (US);
Reed D. Hanson, Chaska, MN (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
The present invention relates to repeatable runout (RRO) compensation of servo control systems that can be used in disc drives or spin-stands. The RRO relates to eccentricity between servo tracks, which were written onto a disc prior to the installation of the disc into the disc drive or spin-stand, and an axis of rotation of the disc. The present invention compensates the servo control loop by canceling the RRO and controlling a head to follow virtual tracks which are eccentric to the data tracks defined by the servo tracks and concentric with the axis of rotation of the disc.