The back of the Macbook Pro, its lid, is not flush. The HDD was thicker then the superdrive and so the right side of the lid does not sit all the way down. I am not sure to leave it or just put the SD back in? What would you do guys? The good news is it all works, but just don't think I like the lid not sitting down all the way. EDIT: Also, on the plus side my MBP is crazy faster!