Photographs of computer tapes; tape specifications
media and data conversion services by Disc Interchange


Tape types:


2.9" W x 2.1" L x 0.4" T
As of this writing there are five different drives: DDS-1, DDS-2, DDS-3, DDS-4 (DAT 40), and DDS-5 (DAT72).
Each drive uses different media.
The original drive was called "DDS", and is alternately referred to as "DDS" and "DDS-1".
DDS-1 drives came in two types, one could use extra length 90 M tapes.
The table below lists the drives, tapes, and capacity.
Drive / Format Tape length Uncompressed 
capacity *
DDS  (DDS-1) 60 M 1.3 GB 2.6 GB
DDS (DDS-1) 90 M 2 GB 4 GB
DDS-2 120 M 4 GB 8 GB
DDS-3 125 M 12 GB 24 GB
DDS-4 (DAT 40) 150 M 20 GB 40 GB
DDS-5 (DAT 72) 170 M 36 GB 72 GB
  • * Capacity at 2:1 compression. Acutal compression depends on data recorded.
  • All tapes are the same physical cartridge size but use different media & drives.
  • There are also 7.5, 15, and 30 meter DDS-1 tapes available.
4mm (DAT) DDS-1, DDS-2, DDS-3, DDS-4 tape
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