IBM Server aka cisco mcs 7800 series

I have a 2011 Cisco MCS 7816 but I know that it’s orgianlly a ibm system x3250 4251. So the problem is that I bought two 250 GB Enterprise class HD’s product number WD2503ABYZ , when I when I go into the bios it will not see the hard drives at all, have you guys encountered this problem before and how did you resove it?

I forgot , that I would like to setup raid 1 with windows 2008 server on this server.