GIGABYTE Network Device GA-7N400 - Manual (Page 14)

Windows NT Operating System
Before creating any partitions, RAID sets must first be created/dissolved using the BIOS RAID Utility.
Once completed, continue booting Windows.
Once Windows is running, open the Disk Administrator window. The Disk Administrator window is
located at:
Start Programs Disk Administrator (Common)
Something similar to the following window should appear:
SATA RAID Function 11