MacBook reporting wrong memory usage

My MacBook is telling me I've used all but about 54MB of my 150GB hard drive. There's no way this is correct - I have a 200 GB external hard drive that I use for all music, movies, etc. - and I can't put anything else on the hard drive because it says that it is full. I've calculated the memory used under applications, system, library, users, etc., and it shouldn't be more than 12 GB. I've also only had the computer for about a month, so I haven't had the time to put that much memory onto the hard drive. Is there anything I can do?
Message was edited by: Steve Von Till

Thats an easy mistake to make. Open iTunes and go to Preferences. Under Advanced uncheck where it says *Copy files to iTunes Music folder when adding to library* If you store your music on a seperate drive and don't uncheck this it makes a copy of everything in iTunes on your internal drive. Once you have unchecked it you can remove the music on your internal drive.

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