I have two hard drives, my original hard drive is a WD Caviar Blue 640GB on which my original Windows 7 64bit was installed on and has all of my installed directories on it. Now, I got a new Samsung Spinpoint F3 1TB, and I cloned my 640GB's data and Windows installation to that 1TB, so now both drives are identical data-wise. When I have either plugged in by themselves via SATA wires, they boot and run flawlessly. But when I plug both in and turn on my PC, it automatically boots from the original 640GB. My final goal is to be able to boot from my 1TB and use that as my system drive, and have the 640GB as a storage drive. Any suggestions?