I recently replaced my HD with an SSD drive. Watching this guide actually helped too!
I would also like to replace the optical drive with a Hard Drive. Would it make much of a difference wether I use a SSD or a 7200rpm HD? I would be using it for video and audio files for Protools and Final Cut Pro that are running on the SSD..
It seems like the negotiated speed on the optical SATA is only 1.5 Gigabit..