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petabyte

[pet-uh-bahyt] /ˈpɛt əˌbaɪt/
noun
1.
2 50 bytes, or 1,024 terabytes.
2.
(loosely) 10 15 or a million billion bytes. Symbol: PB.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for petabyte

petabyte

/ˈpɛtəˌbaɪt/
noun
1.
(computing) 1015 or 250 bytes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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petabyte in Science
petabyte
  (pět'ə-bīt)   
  1. A unit of computer memory or data storage capacity equal to 1,024 terabytes (250 bytes).

  2. One quadrillion bytes. See Note at megabyte.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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petabyte in Technology
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)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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