This tip creates ISO images from DMG images, so they can be burned elsewhere. To convert the file to an ISO image, type the following command at your terminal window:
hdiutil convert /path/to/filename.dmg -format UDTO -o /path/to/savefile.iso
Replace /path/to/filename.dmg with the path and name of the existing .DMG file, and replace /path/to/savefile.iso with the desired path and name for the converted image.