4PCA3+ Booting from SATA-raid array Win-XP

Hi,

I'm having problems booting from SATA raid-0 (stripe) array.

Hardware:

EP-4PCA3+ board
512 MB RAM (PC3200 dual channel)
P4 3.06 800MHz fsb
2x Western Digital Raptor 36.7 GB SATA drives

I can setup a small MS-DOS partition on this array, and then it boots as C:
Installing Win-XP on a 2nd partition works, although I have to ENTER a few
times during boot-up
Booting XP from a single partition doesn't work..

- Right now, I installed an extra harddisk (master on the primary IDE)
- Installed Win-XP on the sata raid-array
- The installation needs a partition on the extra harddisk.
- It works, sata raid array becomes C:, extra harddisk becomes D:,
but the system basically boots from that extra harddisk..

(I upgraded to the latest BIOS version)

Was anybody here able to install Win-XP just using a single partition on a
sata raid-0 array?

Thanks for any advice!