Write a note on Digital Audio Tape.
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Digital Audio Tape (DAT or R-DAT) is a signal recording and playback medium developed by Sonyand introduced in 1987.[1] In appearance it is similar to a Compact Cassette, using 3.81 mm / 0.15" (commonly referred to as 4 mm) magnetic tapeenclosed in a protective shell, but is roughly half the size at 73 mm × 54 mm × 10.5 mm. As the name suggests, the recording is digital rather than analog. DAT has the ability to record at sampling rates equal to, as well as higher and lower than a CD (44.1, 48 or 32 kHz sampling rate respectively) at 16 bitsquantization. If a comparable digital source is copied without returning to the analogue domain, then the DAT will produce an exact clone, unlike other digital media such as Digital Compact Cassette or non-Hi-MD MiniDisc, both of which use a lossy data reduction system.
Media typeMagnetic tapeEncodingLossless real-timeCapacityUp to 120 or 180 minutes (consumer tapes on non-LP mode)Read mechanismRotating headWrite mechanismRotating head, helical scanDeveloped bySonyUsageAudio storage
