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:
Mar. 20, 2007
Filed:
Jan. 12, 2005
James Byrd, Berthoud, CO (US);
Walter Allen, Wellington, CO (US);
James Byrd, Berthoud, CO (US);
Walter Allen, Wellington, CO (US);
Agere Systems, Inc., Allentown, PA (US);
Abstract
One or more bits are added to the embedded repeatable runout correction (ERRC) bit pattern of a servo field so that errors in ERRC bit patterns can be detected and in certain cases corrected. If four bits are added, a single bit error in an ERRC bit pattern can be detected and corrected. If five bits are added, two bit errors in the ERRC bit pattern can be detected. In accordance with the preferred embodiment, the invention uses a single encode table and a single decode table to encode the ERRC pattern to be written to the disk and to decode the ERRC pattern read back from the disk.