The short version of the past 24 hours is that while trying to install 10.7.2 my wife's hard drive decided it had enough, became completely unresponsive, and eventually refused to boot. AHT revealed code 4HDD/11/4000000: SATA(0,0); since I am out of warranty, I'll be looking to replace it myself. Its a mid summer 2010 model. I'm fairly certain its a Duo core 2.4, 4GB ram, 250 HD. If I'm not mistaken, I'll need a 2.5 drive? The other thought I had would be to put a 256 SSD into it -- but can I? It looks like Crucial sells these things in enclosures, but are those only for later models that shipped with SSD? Or is the point of the enclosure for older machines?