A company and, by extension, a tape formAT for computer dATa backup and transfer. The tape is a dATa quality 8mm video cassette recorder tape. Exabyte units can store between five and fourteen gigabytes of dATa per tape. Exabytes are usually ATtached to UnixworkstATions. [WhAT different tape capacities exist? Compare with DAT?] (1995-07-06)