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. 14, 1993
Filed:
Jan. 04, 1993
Masaaki Yasukawa, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A disk drive zone access method for recovering from a zone miss of a disk drive head(s) is used with media that has a plurality of zones each having different data recording frequencies. Data is read with a variable reference synchronizing frequency that can be set to match any one of the data recording frequencies. The method comprises 1) defining a memory space to stores zone miss history in alternative memory spaces according to the head seek direction at the time of a zone miss; 2) referencing the one zone miss history that corresponds to the present head seek direction; 3) estimating a candidate zone where the head is/are most likely to be, based on the zone miss history; 4) setting the variable reference synchronizing frequency to the data recording frequency of the candidate zone; and 5) updating zone miss history in the memory space with the present zone miss data according to the head seek direction at the time of the zone miss.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile