Forgive the total stupidness of what I'm about to ask, but I'm not able to figure out why it is and I need to know so I can fix it. I've had my macbook for 2 years so there's a LOT of crap on it. In addition to me having 9 GB worth of media in itunes, I have two years worth of photos and video clips from my camera. I am continually seeing the "you are running dangerously low on disk space" message. The real reason it is bothering me is I am trying to edit footage and make fan videos with clips of tv shows to music in imovie, and I only seem to have 2 GB of space available at a time. What do I need to do to create more? Can I buy an external hard drive to work off of for that kind of thing? I mean, would that fix my problem? I know I have to back up a lot of my photos and clips soon too.