A few days ago I tried to create a new partition to install windows so I could play a few games that are only available for windows, however, every time I tried to create a new partition I received a error message when using boot camp assistent or disk utility (as I said on this thread: http://forums.macrumors.com/showthread.php?t=1243649&goto=newpost) After a few researches I discovered I would need to defrag my HD because I have lots of multi-giga files and lots of files bigger than 20 mb so the automatic defrag from the system isn't going to work. So my question is: is there any free and good program that would defrag my files? I tried installing iDefrag but I couldn't make it work and I'm not going to pay 20 euros only to run it once (in fact I would only pay for it if it was my only option). I also tried Drive Genius 3 but it didn't work. If there is no free option for me, please tell me which one to buy. Thanks guys for all your help!