Asus P5B Deluxe Sata ports
 

I have an Asus P5B Deluxe MOBO. It has 6 SATA ports, 4 red and 2 are black in color. It says to plug the primary ( boot )hard disc drive to one of the red plugs and and "data" disc's on the black plugs. I do have my HDD plugged into one of the red connector's and it works fine, but I'm confused...