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:
May. 30, 1995
Filed:
Jan. 24, 1994
Robert B Basham, Tucson, AZ (US);
Jonathan M Kiser, Tucson, AZ (US);
Ara S Patapoutian, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A tape drive subsystem discloses that variable length symbols can be used to reliably identify data stored on the tape. Machine controlling procedures are disclosed to encode and decode data for the reliable sensing of the serial number of a media, especially tape cartridges, having different track densities. The subsystem detects the serial number of the media and corrects, or at least detects, error patterns. A variable length symbol code is encoded in a plurality of groups with each group having a 'one' being represented as an erase gap ERG signal covering a first two units of a group, and a 'zero' is represented as one unit of an ERG signal, both followed by four units of an Inter Block Gap IBG signal.