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magnetic tape
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medium used to store data in the form of magnetic fields
Magnetic tape is a storage medium that records data by creating patterns of magnetic fields on a strip of material, similar to how old cassette tapes stored music. It has been important for storing large amounts of information in computers and other devices throughout modern history.
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Encyclopedic overview
7-inch reel of ¼-inch-wide audio recording tape, typical of consumer use in the 1950s–70s
Magnetic tape is a medium for magnetic storage made of a thin, magnetizable coating on a long, narrow strip of plastic film. It was developed in Germany in 1928, based on the earlier magnetic wire recording from Denmark. Devices that use magnetic tape can record and play back audio, visual, and digital computer data.
Excerpted from Wikipedia’s “magnetic tape” article, available under the CC BY-SA 4.0 licence.