Go to Advanced->PCH Storage Configuration->Now Enable PCIe Storage RAID support for both M.2_1 and PCIEX4_1/PCH M.2_1(DIMM.2) PCIE Storage Raid Support
First, take off the cover for the M.2 compartment by removing the screw.This compartment hold M.2 Socket ,insert the M.2 into place. Secure the second M.2 place onto DIMM.2 Module left side. Go to Advanced->PCH Storage Configuration->SATA Mode Select...