I got a new 2012 15" Ivy Bridge MBP, and installed my Crucial M4 256GB SSD in place of the stock drive, with Lion running. Today, I got my HDD caddy and swapped in the stock 750GB drive into the optical bay. Both drives were seen by OS X. So far, so good. Then, I pulled out my handy Windows 7 SP1 installation disc, and using an external enclosure for the removed SuperDrive, proceeded to perform the Boot Camp procedure. Boot Camp inside OS X worked fine -- I got the drivers onto a USB flash drive, it created the BOOTCAMP partition on my optical caddy HDD, and I rebooted to install Windows. Unfortunately, as I had two drives in the system, Windows for some reason did not want to install to Drive 1 (the caddy HDD), even after I formatted it to NTFS. I looked up the error code, and it seems to have been related either to the use of GPT vs MBR, or because Windows doesn't play nice unless it is Drive 0 during installation. So, I unplugged my SSD with OS X on it JUST for the Windows install. Of course, it worked with only the caddy HDD in the system. Windows booted, I got Boot Camp drivers installed from my flash drive, and I was good to go. So I plugged my primary OS X SSD back in, and restarted. OS X boots fine, but when I choose Windows, it says that it can't find the boot drive and to insert a boot disc. So I guess I'm stuck. Anyone have any idea why this is happening? Anybody Boot Camping with Windows in the optical bay caddy on a totally separate drive from the OS X drive? Any help would be greatly appreciated.