Beginning with Mac OS 10.6 Apple's Finder now calculates the size of your drive (internal and external) a bit differently than it did before. The idea now, apparently, is to provide the user with a number that appears "more accurate" than it might have before, when in fact the size reported in previous versions of Mac OS X simply allowed for a cushion.
For example, on a 2-tb external drive, my older desktop (OS 10.5.8) reports the space remaining as 1.07 while my laptop (with 10.6.5) reports 1.18 remaining. But, both machines report the same number of bytes, however (790 billion and change). (By the way, a Windows machine reports the drive size the same way as the older Mac OS X.)
While I can't reproduce the complex explanations for how drive sizes are calculated (nor would I want to), suffice it to say that when you see your drive listed in Snow Leopard it attempts to provide you with a reading that is more in line with the accurate byte calculation. That is, 790 gigs used (to represent the 790+ billion bytes).
Now, aren't you glad you asked?
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