In the mid-1980s, tape storage appeared to be heading toward the graveyard. Storing information on large reels of tape that had to be manually mounted was expensive, inefficient, and prone to human error. In addition, competition from hard disk drives (HDDs) was growing. Data access on HDD was faster because the data was stored in a manner for rapid random access, not linearly as on tape, and H...

Dietzfelbinger. hl. and W' hlaass. The complexity of matrrx transposition on one-tape off-line Turing machines with output tape, Thcorettcal A series of existing lower bound results for deterministic one-tape Turing machines is extended to another, stronger such model suttable for the computatton of functions: one-tape off-line Turing machines wtth a wrote-only output tape. (" OfT-line " means:...

Both magnetic wire and acetate-based magnetic tape were used in the audio industry. Welsh and Lukoff [lj describe the early use of metal tape for digital magnetic recording. Acetate-based tape was used for digital recording by Raytheon at a relatively low tape velocity, as reported by Bloch [2]. At IBM it was decided to pursue an acetate-based plastic magnetic tape for computer input,‘ output b...

Fall COMDEX was the center of numerous showings of new tape technologies offering significant increases in tape capacity and performance. Of interest to users of midrange tape technology was the showing of Linear Tape Open (LTO) tape drives. Just as the upstart Linux operating system is nurturing a small but growing base of users, LTOcompliant products promise to secure a significant portion of...

annual Celebration of Student Research and Creative Activity. Undergraduate research, as one of the signature experiences of a Xavier education, allows our students to do more than study their discipline; instead they become practitioners of their discipline. In their classes, they may study philosophy, science and art; through research with faculty mentors, they become philosophers, scientists...

one of the methods to recognize national background and roots, also to maintain historical and cultural nature is to study different dimensions of physical, martial and athletic activities in ancient iran. the aim of the present study was to identify different sport fields and equipment in ancient iran using content analysis of nine versions of ferdowsi’s “shahnameh” and related literature. als...

A multi-channel Optical Head has been developed to be incorporated with an Optical Tape Drive that enables greater than 1TB capacity and greater than 25 MB/s data transfer rate on a 0.5 mil thick, 0.5 inch wide optical tape that fits in a 3480 style cartridge. The optical design has been optimized to perform at 532 nm with maximum through put in the write path. With use of a 0.6 NA objective le...

Concerning about the social relationship is an important issue in classic and contemporary sociology. The contemporary sociologists employ the concept of social capital to study  the quality and quantity of social relationship within the society. Social capital refers to the capital and resources which people can gain by having ties with each others. For this reason, researchers seek to identif...

Archival demands for digital tape storage systems require smaller spacing between data tracks on the magnetic tape to allow for more data storage on a single cartridge. Increasing track density while maintaining track following provides a challenge for the servo control of the tape drive. In particular, interchangeable tape cartridges and time-varying tape reel diameters during operation cause ...