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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   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)