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IBM Assigned Four Patents

Longitudinal position information on magnetic tape media, fabricating graded media, high density timing based servo format, dynamically controlling tape velocity

Longitudinal position information on magnetic tape media
International Business Machines Corporation,
Armonk, NY, has been assigned a patent (8,896,954) developed by Cherubini, Giovanni, Rueschlikon, and Cideciyan, Roy D., Rueschlikon, Switzerland, for a “l
ongitudinal position information on a magnetic tape media.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape media for storing data includes at least one servo band extending along the magnetic tape media and having servo information encoded by an M-ary alphabet A comprising M>2 different symbols and is arranged in a set of words. Each word of the set of words contains synchronization information, wherein each symbol used for representing the synchronization information is from a set B of m symbols, which set B is a proper subset of the symbols in the alphabet A such that 1.ltoreq.m<M; longitudinal position information, wherein each symbol used for representing the longitudinal position information is from a set C of M-m symbols, which set C is a complementary set to set B; and other information, wherein each symbol used for representing the other information is from the set C of M-m symbols.”

The patent application was filed on October 5, 2012 (13/645,931).

Fabricating graded media
International Business Machines Corporation, Armonk, NY, has been assigned a patent (8,900,730) developed by Bhatia, Charanjit Singh, Pandey, Koashal Kishor Mani, Gaur, Nikita, Singapore, SG, Maurer, Siegfried L., Stormville, NY and Nunes, Ronald W., East Falmouth, MA for a “method of fabricating graded media.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic data storage medium comprising: an ion doped magnetic recording layer having a continuous grading of coercivity or anisotropy, wherein the coercivity or anisotropy is at a minimum substantially at one side of the magnetic recording layer, and having substantial portion of maximum coercivity or anisotropy at the other side of the magnetic recording layer. Also, a method of fabricating a magnetic data storage medium is included. 

The patent application was filed on January 31, 2012 (13/982,987).

High density timing based servo format
International Business Machines Corporation, Armonk, NY, has been assigned a patent (8,902,537), developed by Biskeborn, Robert G., Hollister, CA and Lantz, Mark A., Adliswil, Switzerland, for a “high density timing based servo format .”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A product having a magnetic recording tape with at least one servo track, the at least one servo track having a plurality of first magnetic bars and a plurality of second magnetic bars. The first magnetic bars each have a longitudinal axis oriented between 2 and 88 degrees from the longitudinal axis of the magnetic recording tape. A width of each of the at least one servo track is defined in a direction perpendicular to the longitudinal axis of the magnetic recording tape between sides of the servo track, the sides of each servo track extending along ends of the first magnetic bars. Lengths of the second magnetic bars along the longitudinal axes thereof are less than the width of the associated servo track. 

The patent application was filed on August 12, 2013 (13/964,614).

Dynamically controlling tape velocity
International Business Machines Corporation, Armonk, NY, has been assigned a patent (8,902,531), developed by Bui, Nhan Xuan, Judd, Kevin Bruce, Justo, Roger Javier,Tucson, AZ, Nakayama, Hirokazu, Fujisawa, Japan and Taketomi, Tomoko, Yamato, Japan, for a “dynamically controlling tape velocity .”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity. 

The patent application was filed on August 28, 2012 (13/596,876).

 

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