James Holland writes:
> Don't know why this is... But check how big your other partitions
> are using gparted.

Could it be that he's comparing the "1TB" drives he's bought (which are
marketed as decimal 1x10^12 bytes) with the expected (binary) 2^40 bytes?

That's a 10% reduction in perceived space.  If the disk format has also
reserved the traditional (and now obsolete) 10% for root use only, then
suddenly we're 2.5 TB down from what one would naively expect after
clicking on "Newegg, please send me 12 terabyte drives".

gparted will show the whole capacity (ignoring this root reserve), but
"df" won't.

-- 
 	    Alec Habig, University of Minnesota Duluth Physics Dept.
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		       http://neutrino.d.umn.edu/~habig/