I have been told that Macs cannot boot Windows or anything except OS X from an external USB device. However, Macs can boot Windows from a boot camp partition. So I created a boot camp partition, but I want to boot some DOS version from it. The partition is on the internal HD. My problem is that I removed the CD ROM drive from my MacBook Pro and replaced it with a second hard drive. But now I got an ISO image for a CD for updating the Intel SSD firmware - Intel claims that Intel Macs will simply boot from that CD when inserted, it will start some sort of free DOS, then proceed to update the SSD firmware. I copied the ISO to a USB stick, and was able to boot from it on Windows laptop. But on the Mac, that doesn't work, the USB stick isn't recognized as bootable. So I copied the entire contents to my boot camp partition on my internal HD, and tried to boot from it - but it doesn't show up in Startup Disk, and it doesn't appear as option when I restart and hold down the option key. Any ideas what magic I must invoke to make OS X recognize the boot camp partition with DOS on it?