Hi there,
I had the same issue, what i did was made a custom WinXP Pro boot disk with a program called nLite. When it asked what drivers to include I gave it the SATA Raid drivers. Made the ISO burnt it and booted. The install found both HDD with out having to press F6.
Worked a treat

. Now I just need to find some wireless drivers and I should be set.
Cheers,
Mic