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E:\>dir 30GB.dat
28/02/2015  08:21    34,560,000,000 30GB.dat
...

[ 0:11:23.17] E:\>perl -E"say 34560000000 / 192 / 1024**2;"
171.661376953125

E:\md junk
E:\cd Junk
...
13/03/2015  00:23     1,074,790,400 50
              50 File(s) 53,739,520,000 bytes
               2 Dir(s)  1,490,904,588,288 bytes free

#! perl -slw
use strict;
...

printf "Took %d seconds.\n", $end - $start;