That's why I said earlier best way is to trace them back from your hard drives ( the Barracuda and the SSD). If all the connectors on that cable are being used , then that means one of the 5 devices, is on a cable all to itself.But I can’t find them in my case. Who knows where they are…
My guess is that one cable has your 2 hard drives connected to it and the other cable has your other 3 devices.