Nothing wrong, but never use my Optical Drive and saw a way to add an additional HHD.
Opening the back of a unibody Macbook Pro is like taking apart a watch. Things are really packed in there. I had previously upgraded the main HHD and added ROM, but taking out the Optical Drive was a bit tricky. However, all went well and it powered up and recognized the new HHD right away.
Slow and delicate work. Make sure you have a good work surface and plenty of light. Remember which screws go where. Make sure you have the proper tools.