I'm using a second hdd instead of the internal dvdrom in my macbook pro 2011 (13", i5). How can I install windows 7 as a secondary OS on the secondary HDD I have? I tried to edit the info.plist in boot camp assistant to support usb flash drive on my MBP81 but when I make a bootable flash drive with the bootcamp assistant and reboot, I get no bootable drive error (white on black screen). Same thing happened with rEFIt, doesn't look better with it so for now I removed it. I also tried using a cheap, brand-less USB external dvdrom, but it works just in the OS, but nothing happened in boot time (black screen, doesn't load the cd). Many thanks!