I want to upgrade my Mac mini from SL to Lion. I know I can just download it from the App Store to do this. But what happens if I have Lion, and then want to wipe my HD and do a fresh install of Lion? How would this be accomplished? This closest thing I can find is using Lion's recovery partition to do an internet install. But is this recovery partition hidden enough from Disk Utility so that I don't accidentally wipe it with everything else? I want to upgrade but I need to know how this would work in a world without disks or USB drives.