So here's what I need to do. I'm trying to sell my MacBook Pro and use a different computer. The problem is that the iMac only has 250gb and my MBP has 500gb. So since I got an external that's 1.5tb, I'm trying to partition it so that one has 1tb and the other has 500gb. Then I want to make a carbon copy of my MBP disk to the 500gb external and have the iMac boot on that external. Is it possible? Of course, it won't be as zippy as using the internal but I have no other choice. I gotta sell my MBP. Any answers or suggestions are welcome. Thanks everyone.