I've gotten all these questions before. The secondary HDD is for FRAPS, the more space taken up in the hardrive it saves the movies to, the less FPS you get when you're recording. Don't ask me why.
16 GB RAM is for movie editing.
I don't need an SSD, I could care less about boot speed.
This PC is for gaming, and making videos. (Recording, editing etc.)
Thanks to geofelt for answering my question. I'll look into it.