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The tape was originally 1 ⁄ 4 inch (6.35 mm) wide and anywhere from 300 to 1,500 feet (91 to 457 m) long. Data is written linearly along the length of the tape in one track [ 1 ] (mostly on pre-1980 equipment), or written "serpentine", one track at a time, the drive reversing direction at the end of the tape, and each track's data written in ...
The Bucharest Metro uses 1,432 mm (4 ft 8 + 3 ⁄ 8 in) gauge. The Washington Metro uses 4 ft 8 + 1 ⁄ 4 in (1,429 mm), 1 ⁄ 4 in (6 mm) narrower than standard gauge. The Mount Washington Cog Railway, the world's oldest mountain-climbing rack-and-pinion railway, uses a 4 ft 8 in (1,422 mm) gauge.
Prior to the development of the tape dispenser, 3M's standard clear scotch tape was sold as a roll, and had to be carefully peeled from the end and cut with scissors. To make the product more useful, the scotch tape sales manager at 3M, John Borden, designed the first tape dispenser in 1932, which had a built-in cutting mechanism and would hold the cut end of the tape until its next use.
The cartridge's dimensions are approximately 5.25 by 4 by 0.8 inches (13.3 cm × 10.2 cm × 2.0 cm). The magnetic tape is played at 3.75 inches per second (twice the speed of a cassette), is wound around a single spool, is about 0.25 inches (0.64 cm) wide and contains 8 parallel tracks.
The thickest tape normally used in cassettes is about 16-18 μm in thickness, and is used in C60 cassettes and in shorter lengths such as the C46. As the standard tape speed for a compact cassette is 1 + 7 ⁄ 8 inches per second (4.762 cm/s) and a C60 cassette records 30 minutes per side, a C60 cassette in theory holds 281 + 1 ⁄ 4 ft (85.73 ...
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