saving shots on your external hard drive and having the program run on your computer is still too much? why not take off some stuff from your computer and put it on your harddrive to free up some space?
Interior Crocodile aligator, I drive a chevrolet movie thee a-tor!
in order to get optimal performance you will have to install it to your hard drive (internal). and then you save all the files/video clips to an external (much easier). You can just install final cut pro and all the other programs without content which is about 4gb. If you dont have that much space on your computer's internal hard drive i suggest you move some files around and do it! you dont need all the content for the other programs (50gb or so). IT is just a waste. i did it and never use it. lol