So I am trying to install Windows 7 on my mac through Bootcamp and when trying to partition the disk I got: "The disk cannot be partitioned because some files cannot be moved" message. (I have a Time Machine backup of my mac, just did it now) And then I read that you have to format your mac, which I do NOT want to do. But heard that there was another option by using iDefrag. Can someone explain to me step by step (because I have no idea) what to do and what is the easiest or fastest method. What can I do to be able to partition my disk to install W7?