I recently just used bootcamp to partition my hard drive to use Windows 7. I gave it 20gb, but when I open windows 7, it says I have 889 MB free space and 19.1 GB used space. Why is it that I have such low free disc space? If I partition it with 25gb, then it says I have 990 MB free space and 23 GB of used space. WHYY!!!!?!!?