If I have a bootable disk image, can I boot off it? I tried with one on my boot volume (it recognizes it as an os, and sais it will boot into but doesn't. I once saw a dialogue asking what format to put a disk image, and near the bottom of that list was 'device'. I think I saw this is Disk Utility, but I can't remember. My main reason for wanting to do this is that I don't want to make a partition (either erase and part, or have a messy one) and I don't want to have two mac osx system running undivided (if that's even possible).