Easily convert DMG images to ISO
If you’ve ever wanted to turn a DMG file into an ISO file, look no further. Perhaps your Mac doesn’t have a writable media drive, or it’s not up to speed, or the multitude of other reasons you’d want to burn an ISO from a PC rather than a DMG on your Mac. Forget downloading the shareware apps that promise to convert DMG files to ISO, you can do it right from Mac OS X’s command line, for free, using the hdiutil command.
hdiutil convert imagefile.dmg -format UDTO -o imagefile.iso
This will actually create a file called imagefile.iso.cdr in the current directory, but you’ll want to change that to just .iso, so type:
mv imagefile.iso.cdr imagefile.iso
That’s all there is to it, now your DMG image file can be burned on any PC with the proper hardware.