My plan was (and I think still is) to replace my 500GB HDD with 120GB SSD. Then move the 500 GB SSD to where the Superdrive is. Once I do this, can I buy a 3.5 enclosure and put the removed Superdrive in that and hook it up to the MBP when needed? Or at that point, do I need to buy a separate external Superdrive piece, and just lay the removed one to the side in case I ever decide to put it back in the MBP? Hopefully my question makes sense... Also, when I have both the SSD and the HDD in the machine, where do I go to change settings of where things download to?