Model used us OWC Mercury Electra 3G 240gb. It works with no tweaks whatsoever, no need to do anything other than install. I used it as an external (via USB3 converter) boot drive for Yosemite on a 2011 iMac but with the end goal to become an internal Yosemite boot drive for a MacPro 2007 2,1 post Pike EFI32 replacement.