Having installed a larger 7200rpm hard drive, I would like to use the old OEM drive as back-up. Also, I think I left some of my iPhoto library on it : ( (I made a mess of CarbonCopyCloner so, don't go there). Browsing OWC's site there are a couple of mercury enclosures listed. Which one for the 5400rpm drive? 450 Mhz, OS X.3.2 TIA, Rod