I am trying to export a two hour movie to watch on dvd after editing for 4 months, and was running on 12gb left on my macbook. I then tried to export it HD (8gb) and it eventually failed, saying it had no space left. Even though the movie wasnt exported, it took my 12gb left down to 4gb, so I tried high quality exporting, and it almost finished but failed right at the end, complaining of no space, and even when the file wasnt where I asked it to be it still took my memory away, now leaving me with 400mb. I am so annoyed, and I want to know if I can export the movie to my external harddrive (plug in usb) as an mp4 file, and if so how? This would be a HUGE help as I dont want to have wasted so much time!