Gavin Andresen - 2011-02-19 20:12:37

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1 petabyte is 1015 bytes.

There are 2160 possible BTC addresses, each of which is 160 bits == 20 bytes long.

So to store all of them you need 2160x20 bytes, which is 29,230,032,746,618,058,364,073,696,654,325,660 petabytes.