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. 25, 2012
Filed:
Jan. 09, 2009
Roy D. Cideciyan, Rueschlikon, CH;
Evangelos S. Eleftheriou, Zurich, CH;
Hisato Matsuo, Kanagawa, JP;
Thomas Mittelholzer, Zurich, CH;
Paul J. Seger, Tucson, AZ (US);
Keisuke Tanaka, Tokyo-to, JP;
Roy D. Cideciyan, Rueschlikon, CH;
Evangelos S. Eleftheriou, Zurich, CH;
Hisato Matsuo, Kanagawa, JP;
Thomas Mittelholzer, Zurich, CH;
Paul J. Seger, Tucson, AZ (US);
Keisuke Tanaka, Tokyo-to, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Conventional C2 coding and interleaving for multi-track data tape in LTO-3/4 do not support recording data onto a number of concurrent tracks which is not a power of two. Higher-rate longer C2 codes, which do not degrade error rate performance, are provided. An adjustable format and interleaving scheme accommodates future tape drives in which the number of concurrent tracks is not necessarily a power of two. A data set is segmented into a plurality of unencoded subdata sets and parity bytes are generated for each row and column. The parameters of the C2 code include Nas the least common multiple of the number of possible tracks to which codeword objects are to be written. COs are formed from NC1 codewords, mapped onto a logical data track according to information within headers of the CO and modulation encoded into synchronized COs which are written to the tape.