Friday, July 31, 2009

Convert .cdr to .iso in OS X

Macs have a lot of build in features, including images of disks with the bundled Disk Utility application. Unfortunately, the format that Macs create disk images in for CDs and DVDs has a .cdr file extension. The most common file formats for CDs and DVDs is .iso and sometimes .img is used. The .cdr images that Macs create are burnable images, but if you want to create an image to a more common format, here is how you do it:
$ hdiutil makehybrid -iso -joliet -o [filename].iso [filename].cdr
This method does require that you first create the .cdr image.


  1. Thanks! But you have the source/destination reversed. It should be:
    hdiutil makehybrid -iso -joliet -o [filename].cdr [filename].iso

    1. That's not correct. The output file is always the one directly after the -o flag, so in your case this would create an ISO format file name [filename].cdr from the (possibly non-existent) [filename.iso]

      You could do:
      hdiutil makehybrid -iso -joliet [filename].cdr -o [filename].iso

  2. I keep reading in different places that you can just change the .cdr extension to .iso without doing any further conversion. Can you verify whether that is true?

  3. id you change the extension, osx will continue to open it because the extension is ignored, but the file will not be a ISO format

  4. can i use this to convert dmg to iso? seemed to work when i tried it...


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