Creating ISO files on iMac

  1. Open Terminal and check which device you want to back up using following command: drutil status
  2. Unmount the CD/DVD Drive: diskutil unmountDisk /dev/disk2
  3. Create an image of the disk: dd if=/dev/disk2 of=/path/name.iso
  4. Re-mount CD/DVD Drive again: diskutil mountDisk /dev/disk