Hi I am running a late 2009 MacBook Pro with Lion 10.7.5 on which I have removed the DVD rom and replaced it with an SSD. Therefore I have moved my "Home" folder to the regular HDD in order to save space on my small SSD. I am now considering updating to Mountain Lion but I have some questions first: 1) My system is working nicely. Do I need to do a clean install? 2) If I don't do a clean install. Can I just mount the image from the App Store and install? Or do I need to do something special considering my 2 disk setup with a moved "home" folder? PS. My system has two user accounts. An "admin" account which I never use and a regular user which is my primary account. PSS. There is a BootCamp partition on the regular HDD.