I purchased a computer that comes with OS X, and I can't run boot camp according to the seller. He said that I can however install windows by disconnecting the hard drive it came with and use a SATA compatible drive to install windows on that. From there reconnect the first drive and it should boot to either OS at launch. I'm a little unsure on this, but learning sometimes means stepping outside the box. Is there any guidance on this somewhere? And more importantly, I was going to use an old hard drive from a 2009 MacBook Pro as the windows drive after erasing it. How can I tell if it is SATA compatible?