zettabyte

from WordNet (r) 3.0 (2006)

zettabyte
    n 1: a unit of information equal to 1000 exabytes or 10^21 bytes
         [syn: {zettabyte}, {ZB}]
    2: a unit of information equal to 1024 exbibytes or 2^70 bytes
       [syn: {zettabyte}, {zebibyte}, {ZB}, {ZiB}]

from The Free On-line Dictionary of Computing (8 July 2008)

zettabyte

   <unit> 2^70 = 1,180,591,620,717,411,303,424 {bytes} = 1024
   {exabytes}.

   See {prefix}.

   (1997-05-02)