Hi, Just wanted to share my experience so maybe it will help someone else with the same scenario. I have a brand new MBP 15" that I bought with apple's 128Gb SSD. My plan from the beginning was to replace the superdrive with a data doubler and a 750Gb 7200 HD, so this is exactly what I did and everything went just as expected. My trouble started when I tried to install Windows 7 on the 750Gb with bootcamp. I ran the bootcamp utility inside OSX and created a 100Gb partition for win7 on my secondary disk. Then I restarted the computer and put the Windows 7 install disc in my external usb drive (remember superdrive is removed because of datadoubler). I tried several things, including two different external usb drives, but I just couldn't boot the win7 install disc from an external dvd drive even though both drives work just fine inside OSX. It just happens that it is impossible to boot a 2011 MBP from an external usb drive. I really tried a lot of options, including holding the option key and installing stuff like REFIT, but it always refused to boot from my external drive. So, here is how I solved my problem: I reopened the laptop and removed my main SSD disk to replace it with my 750Gb hd and I also put back the superdrive. So now my computer couldn't boot at all, but since the partition for windows was already on the HD and the superdrive was in, I was finally able to boot win7 install disk and install windows 7. Lastly, I reopen the laptop and replaced everything as wanted (SSD in main bay, datadoubler with 750Gb in secondary bay and superdrive removed) So now I finally have a dual boot system that works flawlessly, but it wasn't easy to achieve! So I just though I should share and maybe help someone in the same situation. Bootcamp dual boot can be done on a MBP 2011 with windows installed on a secondary disk, but you just can't install it using an external usb drive, it has to be done using the internal superdrive. Or at least it was the only way I was able to do it. Maybe there is another way, but I really doubt it, because I really read a LOT of thread and tried many many things and nothing else worked for me. Maybe with a firewire external drive, but I didn't have one to try it out. enjoy!