I was looking to upgrade my Macbook Pro 13" (Mid 2012) with SSD storage and replacing the optical drive with more storage. I read somewhere that it is best to place the SSD drive in the original HDD position and to move a HDD to the optical drive position. Will the stock Macbook Pro HDD fit in the optical drive bay when in the caddy? And is this the best set up for performance gains? I was going to use the SSD as a boot drive rather than extra storage because I heard its a lot quicker. All ideas and set ups are appreciated.