What I mean is, let's say I have a .dmg file or any file for that matter on my external hard drive / flash drive for storage, and now I want to burn that file onto a CD / DVD for distribution. My logic tells me to copy it to the desktop / computer first, then burn it to the CD from there....but is that additional step necessary? Can I just burn the file onto the CD from the external hard drive / flash drive? When I have my external hard drive mounted, I can choose the option to do it, but just wondering if there would be slowdowns / hiccups, wouldn't burn properly, etc. Thanks!