the mobo suports raid -> 6 x SATA 6Gb/s port(s) Support Raid 0, 1, 5, 10
have you instaled the software for it?
and read in the manual if there is spesific ports you have to plug the drives in for it to work.
i know some boards you have to have it in spesific ports for it to work
and software and hardware is 2 diffrent things.