Digital audio tape (DAT) has something to do with the tape which stores data digitally rather than in traditional analogue format.
Current DATs use 16-bit word size and 44.1 or 48kHz sample rate giving CD quality. However, shelf life is currently an unknown quantity.
Ref: 122286/2006-10-09
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Digital (Digital refers to a signal that consists of ...)
DAT (DAT is the acronym of Digital audio tape.)