Hi all ! Thanks for your advice in my previous thread. I still have a question about liberating disc space. If I do format my macbook, how do I do it? How is it in the OS X? I did that once on my old PC but never on a mac, this is my first mac. Please give me some advice or direct me to some guide. also, will I be able to have all of what I originally had installed? what would I lose forever? thanks in advance !