I have a seasonic focus 750 psu and three sata ddevices: 1 standard burner, 1 blue ray burner, and one large capacity hdd. The sata power cables that come with the psu have multiple connectors. I thought I would only need one, but I can only get one device to show up in the bios. There appears to be 4 sata power connectors on the psu, do I need to have only one device per connector? Seems silly to have multiple connectors and only one device. Thanks!