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Disk Utility on the MAc is one of those hidden gems which does so much however is hidden away and has a terrible interface which hides its features. Very un-Apple like. OSX Dail posted a really great guide on using it to convert file containers such as IOS and DMG.
Need to convert a DMG disk image file to a CDR or ISO disk image format? Don’t bother downloading any third party tools, all you need for conversion is built right into Mac OS X and you don’t even have to go the command line route for most cases.
Going from DMG to CDR is as easy as it gets:
Conversion happens very quickly and you’ll find the converted CDR file at the destination where you saved it. It’s also immediately visible in the Disk Utility sidebar if you want to do something else with the file.
Now if you want to get the CDR file to ISO format, there are a few easy ways to do that.
You can think of a .cdr as the Mac variation of a .iso disk image, and in fact you can often convert the cdr to iso just by renaming the file extension from the Finder. If you don’t have file extensions showing in Mac OS X you’ll need to do that first, then just rename the extension to .iso and accept the changes by selecting “Use .iso”.
It’s important to point out the file extension method typically works fine on a Mac but if you want to use the resulting image to burn a bootable disk, or burn it through Windows or Linux, you’ll probably want to go with the more complete method shown below.
If you want to be certain the ISO conversion and its headers are accurate, jump to the command line by launching Terminal, found in /Applications/Utilities/, and then using the following hdiutil command:
hdiutil convert /path/imagefile.cdr -format UDTO -o /path/convertedimage.iso
Be sure to plug in the correct paths for the both the input and output file.