GIGABYTE Network Device GA-7N400 - Manual (Page 11)

Windows XP/2000 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 Management window located at:
Control Panel Administrative Tools Computer Management Storage Disk Management
Something similar to the following window should appear:
SECTION 1
SECTION 3
SECTION 2
SATA RAID Function 8