just a little note to all who are unable to enter the raid menu with ctrl-g:
I have installed everything correctly on my GA-D525TUD and the post-screen with the ctrl-g message also appeared. but when I was hitting ctrl-g nothing happened. the screen ended again in "verifying dmi pool"... "disk boot failure" etc.
after spending some hours on this problem, upgrading bios firmware etc. I switched my keyboard from the usb to the keyboard port. after that, I was able to send the ctrl-g command.
strange thing is, I was able to enter the bios when my keyboard was connected to the usb port. so, I assumed that my keyboard was working fine...
so, always plug your keyboard into the keyboard port instead of usb, if you're encountering strange problems :-)