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[pet-uh-bahyt] /ˈpɛt əˌbaɪt/

2 50 , or 1,024 .
(loosely) 10 15 or a million billion bytes. Symbol: PB.
(computing) 1015 or 250 bytes

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.


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