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DDS-1 (Digital Data Storage) 4mm tape generally comes in 60 meter (120 minute) or 90 meter (180 minute) lengths and is designed for "mission critical" computer tape backup.
The tape used for 60 meter (120 minute) computer grade DDS tapes and audio tape is basically the same (90 meter being thinner). Computer grade tape is taken from the center of the roll (before slitting), and must meet strict ANSI standards. The tape has a much lower BER (Bit Error Rate) than most DAT tape and is significantly more reliable. Unlike audio DAT tape, DDS tape is certified "error free".
DDS-1 may be used in place of audio DAT tape and is preferred by most people. DDS-2 and up can not be used as an audio DAT tape.
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