Problem with booting from SATA Raid array

[Big Gay Al1]

Hello everyone. I have recently put two WD 160Gb sata2 drives in raid0 array with the intention of having them as my main drives and my old 80gb as a backup disk. I installed windows on them and everything was working perfectly. Both currnetly have windows xp installed.

The only problem is when i unplug the IDE hdd (80GB) windows will not boot. It gets through the post screen and everything fine, but then says that it cannot boot and needs a system disk. For some reason it will not recognise that there is an operating system on the RAID array. I am completely baffled coz i have tried chagnin hdd boot priorites and everything to do with the hdds in the bios and it still wont work.

My system is as follows:
Intel Pentium Dual E2160
DFI infinity P965 Dark-S
HD2600XT
2GB Geil ddr 800
2x WD 160GB SataII in raid 0
1x WD 80gb ata100

I hope somebody has some ideas to help me with this problem, as the DFI tech guys didnt respond to my question. Thanks in advance.

Al