Since 16,777,216 is 2^24, and a terabyte is 2^40 (at least as programmers count, by 1024s instead of by 1000s), you must have 2^64 bytes in use! It can also be referred to as 16 exabytes (from the sequence mega, giga, tera, peta, exa).
That's 16 quintillion bytes in the
continental system used in the U.S., France, and other countries or 16 trillion in the
English system used in the U.K.
Since one published estimate put the sum of mankind's knowledge at 12 exabytes, and you have more than that, I conclude that some of your data must be redundant!
Of course, since 2^64 is also the same bit pattern as flat 0 in 64-bit binary arithmetic, there is a teeny tiny chance that a bug in Mac OS X is causing you to get the wrong display. Nawwwww!
