petabyte

from WordNet (r) 3.0 (2006)

petabyte
    n 1: a unit of information equal to 1000 terabytes or 10^15
         bytes [syn: {petabyte}, {PB}]
    2: a unit of information equal to 1024 tebibytes or 2^50 bytes
       [syn: {petabyte}, {pebibyte}, {PB}, {PiB}]

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

petabyte

   <unit> 2^50 = 1,125,899,906,842,624 {bytes} = 1024 {terabytes}
   or roughly 10^15 bytes.  1024 petabytes is one {exabyte}.

   Google is estimated
   (http://www.cio.com/article/135700/Seven_Wonders_of_the_IT_World/3)
   to store about 200 petabytes of data in about 25 {data
   centers} around the world.

   See {prefix}.

   (2007-09-13)