Maybe the 2011 MBP has disabled USB boot, any idea? I replaced the original hdd with an Intel X25 ssd recently, with the SuperDrive replaced by the original hdd. (I use the mce optibay) When I try to upgrade the firmware of my ssd, the new MBP refused to boot from "external superdrive". I've tried the win7/ubuntu cdrom, none of them worked. It seems the new MBP will only boot from internal superdrive when it is exactly placed inside the machine. Any solution here?