Just installed and cloned Boot Drive to my new SSD. Incredibly fast launching programs. I have all my applications on this, is that what should be on there? Also have my iTunes library (50GB) should I move that off the SSD? Follow-up questions. Will this plan work... Erase my WD 640 Caviar Blue which is my former Boot Drive in Bay #1. Partition it into two drives Partition#1 use as my Photoshop and Lightroom scratch discs. Partition#2 Clone the Boot Drive back to this drive as a back up? Or does the Back-up Boot Drive need to be on an external drive? I have the two Caviar Blacks 2TB in Bays #3 and 4. If I added a third Caviar Black 2TB in Bay #2 (replacing my Samsung 1TB) Can I use the 2 of the Blacks in a RAID and use the 3rd as Time Machine backup for the other two?