I'm running 10.6.8 and when I try to use BootCamp, it tells me I need "at least 10GB of free space", which is interesting since I have 21GB of free space. However, trying to fix this issue has seemed pointless at this rate and I remember there used to be way to create bootable USBs using only Disk Utility during the Vista era. I had tried converting my .iso to .dmg and mounting them and 'burning' them to the flash drive, but nothing has seemed to work. All the tutorials I have found online use BootCamp, which is what I want to stay away from since it does not work for me.