Tech, Gadgets, Photography, Social Media and Poor Spelling

Converting ISO, DMG and CDR files on a Mac.

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.

Converting a DMG to CDR

Going from DMG to CDR is as easy as it gets:

  1. Mount the DMG disk image you want converted to CDR format by double-clicking it in the Finder
  2. Launch Disk Utility found in /Applications/Utilities/
  3. Select the .dmg image from the sidebar list and then click the “Convert” button in the toolbar
  4. Pull down the “Image Format” menu and choose “DVD/CD master”, then click “Save”

Quick DMG to CDR Conversion

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.

Converting the CDR to ISO the Easy Way

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”.

Easy CDR to ISO conversion

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.

Converting CDR to ISO via Command Line

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.


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This entry was posted on July 19, 2012 by in Apple, howto, ilike, OsX, tip and tagged , , , , , , , , , , , , .
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