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. 27, 1981
Filed:
Dec. 26, 1979
Applicant:
Inventors:
Rolf Andresen, Tucson, AZ (US);
John H Christian, Tucson, AZ (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360135 ; 360 77 ; 360 78 ;
Abstract
A disk file employs a disk having sectors of track-following servo information interspersed around the disk between data portions. Included in each sector is a SYNC signal which is encoded to indicate the validity or invalidity of the servo information in that sector. The servo information in a sector is used only if the SYNC signal indicates that it is valid.