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