Gavin Andresen -
2011-02-19 20:12:37
1 petabyte is 10
15
bytes.
There are 2
160
possible BTC addresses, each of which is 160 bits == 20 bytes long.
So to store all of them you need 2
160
x20 bytes, which is 29,230,032,746,618,058,364,073,696,654,325,660 petabytes.