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, 2004
Filed:
Jul. 17, 2001
Applicant:
Inventors:
Nhan X. Bui, Tucson, AZ (US);
John Alexander Koski, Tucson, AZ (US);
Akimitsu Sasaki, Yokohama, JP;
Keisuke Tanaka, Kawasaki, JP;
Kazuhiro Tsuruta, Kanagawa, JP;
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 1/518 ; G11B 1/546 ; G11B 5/09 ;
U.S. Cl.
CPC ...
G11B 1/518 ; G11B 1/546 ; G11B 5/09 ;
Abstract
A method and apparatus for providing linear position (LPOS) estimations. If valid LPOS data may be detected from the tape, then a first method for LPOS estimation is performed using the Hall effect sensors. If valid LPOS data may not be detected from the tape, then an error recovery procedure (ERP) is invoked so that a second method for LPOS estimation is used to provide accurate LPOS information which is synchronized to a validly detected LPOS from tape within about 1 meter prior to the desired data record.