Hey all, I just received my new hard drives in the mail and I would like to know if this is possible... My MP came with the stock WD 640 blue and I just purchased 2x 640 Blacks and 1x 1 TB Black (woohoo, excited) What I want to do is as follows: Slot one: 640 black Slot two: Apple 640 Slot three: 640 black Slot four: 1 TB black With this configuration can I keep booting the computer with disk two until I set up the other drives and do a fresh install on drive one (maybe a week from now)? I just want to be able to test the drives out in this config since this is the way I want them permanently. Will this work? Can I boot up with disk two and keep using the computer? How should I set this up? Do I have to tell the mac os which is my new startup disk before I move the stock apple drive? One more question: What is a good utility for checking out these new hard drives thoroughly? I want to make sure they are working properly and not defective. I don't mind if it takes a while because I want them checked good. I also want something that can read the SMART info since I purchased one from a guy on Craigs who says it is new but he did open it. I assume the SMART will tell me the hours of use? Thanks for all of the help!