DLT

from The Free On-line Dictionary of Computing (8 July 2008)
Digital Linear Tape
DLT

   <storage> (DLT) A kind of {magnetic tape} drive
   originally developed by {DEC} and now marketed by {Quantum}.

   DLT drives implement the {Digital Lempel Ziv 1} (DLZ1)
   {compression} {algorithm} in a combination of {hardware} and
   {firmware}.  They use a popular chip by {Stac} (now {hi/fn})
   to do the string searching.  Counting, sorting and {Huffman
   coding} are done in firmware (with hardware support for the
   Huffman algorithm?).

   In April 1997 DLT drives can transfer 5 {megabytes} per second
   and can store 35 {gigabytes} on a single cartridge.
   Compression might roughly double these figures.

   (1997-04-05)