Seasons Greetings gurus! So, as per title, I've put a 240 gig SSD in my Mid 2012 MBP and put the original 750 gig HDD in an optical bay caddy. Now, my iTunes, iMovie & iPhoto libraries are all on the 750 gig drive and I'd like to keep them there, but this drive was the drive I was using until I put the SSD in so it also has Mountain Lion, profile folders, etc on there too. All I want to use it as is a simple data storage drive, so what do I need to do now to remove ML etc and just have my music/photo/movie libraries on there? Also, I use the MBP with a Thunderbolt Display, that has a 1TB USB HDD permanently plugged in the back for Time Machine Backups, can I still use that to back up the laptop in it's "2 drive" configuration, seeing as the total capacity of the 2 drives is less than the USB drive? Cheers.