Ok, here's a quote from Wikepedia. "Some 4-pin Molex to SATA power connectors have electronics included in the connector to also provide the 3.3 V power. Understanding this, drive manufacturers have largely left the 3.3 V power lines unused." That just about answers my question, thanks for the help.
So, more than likely, i hooked up a wire to the plug that will never be used. But i guess it's good to have it just in case. Lol.