<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 to store about 200 petabytes of data in about 25 data centers around the world.
See prefix.
(2007-09-13)
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Nearby terms: pessimal « pessimising compiler « peta- « petabyte » petaflops » petdingo » Peter Chen