Setting the SATA mode to RAID
Head on over to the Advanced tab. Inside, select "SATA Configuration," followed by "SATA Mode Selection", and then "RAID". You should then be returned to the SATA Configuration menu, and with the "SATA Mode Selection" value set to ‘RAID’. be sure to save the current BIOS configuration before exiting the utility. This can usually be achieved by pressing the F10 button.
Enter the Advanced menu and select the SATA Configuration item.
The SATA Mode Selection value should be ‘RAID’ if the configuration was performed properly.
Select the RAID option at the SATA Mode Selection menu.
At the SATA Configuration menu, select the SATA Mode Selection item.
Save the settings and exit the BIOS utility.