I have a 2006 core2duo white 17 iMac here that I put a 1GB drive into not long ago. It has OS X 10.7 Lion installed. I recently purchased an aluminium core2duo 2007/8 iMac from ebay (due to arrive today or tomorrow) that apparently needs a new hard drive. Rather than spending a day backing up the hdd, reinstalling OS X and migrating all my files, can I just plop my current hard drive into the newer iMac and leave the OS X install and files as is? Now if this was Windows, I know this would be an insane question, but I have used target disk mode before on various macs and it almost seems that one install of OS X can fit all models. Although I don't know much about this to be honest. Maybe target disk mode boots into a limited safe mode? I dunno?