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The DIGITAL Audio Types (DAT) is a support of recording digital audio on magnetic band 3.81mm conceived by Sony in the Eighties with an aim of replacing the musicassette (K7). The support, little supported by the editors, sensitive to the cold in front of the high performances of the system, forever have the favors of the general public. It is useful today like support for the data back-ups of great capacity and like " master" for the recordings in studio. However, this support is in severe lose speed, that it is for the music or data record, vis-a-vis the optical supports and with the hard drives. It, moreover, is not supported more by the majority of the manufacturers, his originator at the head. Cassettes DAT are smaller than the traditional audio cassettes since their size is of 73mm × 54mm × 10.5mm.

The technology of the DAT is close to that of the Magnétoscope S, using a leaning rotary head to record the data. That prevents the DAT from being cut out then restuck like the traditional cassettes. That also makes it possible to store a greater quantity of data over the same length of magnetic band. Standard DAT allows qualities of recording of 32 Khz in 12 bits, and of 32 Khz, 44.1 Khz or 48 Khz in 16 bits. Certain rare recorders operate apart from the standard up to 96 Khz of 24 bits, with the detriment a tape speed of the band which is doubled (HHS).

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