Thanks anybody for taking the time I bought the latest/greatest 27" iMac last Spring. 32GB Ram 3.5GHZ i7 chip. Really wanted and needed something fast without getting the MacPro. I edit Video professionally with Final Cut X. Everything edited is Prores422 files....1920x1080 60p My set up seems to make sense to me, but the computer just doesn't seem like it is as fast as rendering/exporting/displaying than it should be. I get the beach ball quite a few times when I hit play on my timeline. Here's my external HD set up. HOW SHOULD I DO THIS? My final cut libraries are on a USB3 drive connected straight into the iMac My final cut video files (all the pro-res files) and connected thunderbolt to a laCie eSATA break-out box...then eSATA to 7200rpm LaCie D2's My Final Cut project elements (music, stills, anything that isn't video) is thunderbolt to firewire 800 to 7200rpm LaCie D2 I know ideal would be a thunderbolt drives....but until then... Any Help would be greatly appreciated.