I recently decided that it would be a good idea to start backing up my MacPro. Phase one of my strategy goes like this; 1. Get 500GB drive and mount it internally in the MacPro, move /home to this drive. Doing so will keep my OS/Apps on one drive, and my data on another. Data will be backed up daily; the OS/Apps will be backed up weekly. Ordered 500 GB Segate from Newegg. 2. Get external Firewire drive for back up. I decided on the OWC Mercury Elite Pro-AL single bay. Originally I decided Id go with a 750 GB, but after looking at the price difference decided Id go with the 500GB for now. As my 500GB data drive fills up Ill probably get a second enclosure, and another drive. I then decided to order the bare enclosure from OWC and another 500GB Segate drive from Newegg as Newegg was selling the drives for $80.00 off. Now here is where it gets interesting. Got all three boxes yesterday, and opened up the box with the OWC enclosure. I opened the enclosure and right off the bat something didnt look right. All I see is an IDE connector and power connection. Thats not going to work well with the SATA drives I just ordered. A call to OWC reveals that the only external housing that works with SATA drives is the new eSATA / FW / USB housing. So I get an RMA number so I can do the exchange. I didnt get to the PostNet in time to ship it out, so the enclosure came back home with me. I figured I might as well install the 500GB internal drive in the MacPro. Guess what, it was IDE not SATA. I didnt even think the newer drives came in IDE, I just assumed that everything was SATA nowadays. OK so this works out for the external drive but not so well for the MacPro. I decide to check the 2nd drive I ordered from NewEgg (The one that had been intended for use as an external drive), and guess what its SATA. So despite the fact I screwed up by not checking interfaces when I ordered it all worked itself out in the end. I really lucked out on this one.