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:
Jan. 07, 2003
Filed:
Aug. 04, 2000
Christopher P. Zook, late of Longmont, CO (US);
Cirrus Logic, Inc., Freemont, CA (US);
Abstract
A rotating storage medium has an index mark-indicating sequence recorded thereon, the index mark-indicating sequence comprised of bits distributed over plural servo wedges. The index mark-indicating sequence is comprised of at least one bit in each of a specified number of plural servo wedges per track, the specified number forming a subset of the servo wedges of the rotating storage medium. The specified number (subset) of plural servo wedges per track preferably is comprised of the servo wedge which contains the index mark a predetermined number (m−1) of consecutive servo wedges. The subset of plural servo wedges may be positioned to precede and include the servo wedge which physically contains the index mark, or may be offset therefrom. Both the synchronization marks of the plural servo wedges and the index mark-indicating sequence are preferably fault tolerant. The bits used to form the sequence (which is checked against a predefined reference index mark-indicating sequence) are preferably recorded in synchronization marks of the specified number of plural servo wedges per track, and particularly in a sequence entry bit thereof.