I have a 40gb ps3 with no music movies or pictures etc there is little game data utility and saved data utility yet my ps3 says there is only 12gb remaining what is taking up the rest?

I have a 40gb ps3 with no music movies or pictures etc there is little game data utility and saved data utility yet my ps3 says there is only 12gb remaining what is taking up the rest?
its probably you're saved game data