Ok, so the word is that my spanking new Alienware 18 laptop supports up to 3 storage drives plus the msata cache (4 total drives). I currently have the 1tb and 80gb msata and I want to add 2 storage drives to my configuration. The owners manual only appears to show a way to have 2 drives despite mentioning that it supports 3. The caddy shown holds 2, where is the third slot? I haven't actually opened my machine yet and this may be obvious once opened, but it seems that the manual should have shown its location.

Any clues?