Asus RS720-E7/RS12 - Manual (Page 160)

7-6 Chapter 7: Driver installation
4. A message appears, reminding you to insert the installation media containing
the driver of the RAID controller driver. If you have only one optical drive
installed in your system, eject the Windows OS installation disc and replace
with the motherboard Support DVD into the optical drive. Click Browse to
continue.
5. Locate the driver in the corresponding folder of the Support DVD, and then
click OK to continue.
6. Select the RAID controller driver you need from the list and click Next.
7. When the system finishes loading the RAID driver, replace the motherboard
Support DVD with the Windows Server installation disc. Select the drive to
install Windows and click Next.
8. Setup then proceeds with the OS installation. Follow screen instructions to
continue.