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Garnett said:

sabby if i had nothing on my 120 gig it would say 90 gigs,so if i installed 60 gigs it would tell me 30 gigs left,it wouldnt say 30 gigs left and 20 gigs you cant use.

Try clearing the cache and see what happens.

The 360 doesn't reserve 30 gigs of space so you probably have other stuff installed.  When it says you have nothing installed, are you just looking at the games tab?  Do you have movies/music/themes/pictures or whatever else installed or stored?