I do photo and video work. Need more speed with Final Cut Express and PS3. I use my ext. FW drive for a scratch disc. The 500 gig ext. is just storage fo music, movies etc. Am I better off using a different ext. drive? Should I use a FW800 drive? What's the story with the FW sata drives? And I know that a MACPRO would have been a better choice, but this was Free.