14 responses

  1. hws
    July 18, 2012

    It seems this hint is more about first creating and then converting ISO images into CD/DVD. I have burned dozens of ISOs from within Disk Utility over the years. Since (probably Panther) I’ve never bothered to change the extension, all I have to do is start with an ISO disk image and click “burn”. Never had a problem booting the result on windoze or linux machine.

    • Daniel
      July 31, 2017

      You can only do this if you have a mac with a burner,however, that would make this article senseless and unnecessary. This article is for someone who was given an image on mac format who doesn’t have a burner but does on a pc, and so needs to convert to transfer to pc to burn.

  2. Wycito
    October 8, 2012

    He meant it if you are to burn the image in a linux or windows machine and you need to convert it, in my case I needed just that as I have OS X running on a VM and cant burn from the guest OS, have to do it through my debian OS

  3. iDiesel
    December 11, 2012

    So I did this and the resulting file was ‘filename.iso.cdr’ It’s like it converted it from a .cdr file to a .cdr file. Is this INDEED an .iso file?

    • mbison
      December 28, 2012

      After converting and checking md5 the content of files are the same:
      MD5 (image.cdr) = 0f75c64de4b10fd581845aba99e1591d
      MD5 (image.iso.cdr) = 0f75c64de4b10fd581845aba99e1591d

      • Colin
        January 19, 2013

        I also tested this with similar results – If the MD5’s are the same, the files are by definition identical (well, down to an irrelevant margin of error, anyway).

        Therefore .cdr files ARE .iso files, so you don’t need to do anything other than rename it.

  4. WebAddict
    November 17, 2013

    If you need to convert *.cdr to *.iso, then use:

    hdiutil makehybrid -iso -joliet -o filename.iso filename.cdr

    • WebAddict2
      April 25, 2016

      This works for me. OS X 10.11.4

    • soulitude
      July 22, 2016
      hdiutil: makehybrid failed - Operation not permitted

      OS X 10.11.6

      • soulitude
        July 22, 2016

        OK, I had to prefix it with


        , but I’m not sure why it needs superuser to convert to the same folder as the input file (external disk, owner:me/group:staff, write permissions).

  5. Brenza
    October 14, 2014

    Not working with macos 10.9 cdr image

  6. Marco
    May 3, 2015

    I was having problems creating a bootable USB stick on a MAC to install Ubuntu on an HP laptop with Windows 8.1 installed. I did exactly as said in this post with and additional step and it worked perfectly:
    1. converted .iso file downloaded from Ubuntu website to .dmg from terminal:
    hdiutil convert -format UDRW -o file.dmg file.iso

    2. converted .dmg to .cdr using Disk Utility as explained above

    3. renamed the .cdr to .iso

    4. inserted USB stick and unmounted it from terminal:
    diskutil unmountDisk /dev/diskN
    where N is the disk number of the device.

    5. created USB bootable device from terminal:
    sudo dd if=file.img of=/dev/rdiskN bs=1m

    6. Ejected device from terminal:
    diskutil eject /dev/diskN

    I then restarted the laptop with the USB stick inserted. I had to enter the BIOS (F10) to change to Legacy mode in the Boot options, save and exit (F10) and choose the USB stick as the device to boot from (F9).

  7. Dave
    October 5, 2016

    None of this works with full release of Sierra. Very frustrating.

    • NoName
      July 17, 2017

      It’s true, it doesn’t work with Sierra ☹

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