I don't know if this is the right place to ask it but hope so. I have a Disk Warrior 4.4 DVD.cdr file. In previous OSX I could boot a Mac from a DVD. Present Macs do not seem to allow it (I have now Mavericks in a new MacPro). In order to have a possibility to check the main drive of the new MacPro from outside with Disk Warrior (in case I might one day need it) I tried unsuccessfully to make a bootable USB stick with that Disk Warrior file in it. I googled and found in "blog.lewan.com" a step by step instruction how to transform any ISO file into a img (not needed in my case since a .cdr is already an Image) and how, using in the Terminal hdiutil and diskutil the needed file should be finally transferred to the USB stick. In such a way by pressing the Alt key when booting the Mac I might choose to boot from the key and use in my case Disk Warrior. So I thought... However I have not found any way to make it work. Neither copying directly the .cdr file to the USB stick not transforming the .cdr (which is already an Image!) into a .dmg nor any other way (for instance use "Restore" in Disk Utility) brought me a bootable USB stick with Disk Warrior in it. When pressing the Alt key at booting the computer I only see the small EFI volume created on the USB stick, but not the Disk Warrior part of it. Any help will be greatly appreciated !!!!