thx for your reply.
Tho the m2n32 isnt really a 99$ mainboard, its one of asus top notch mainboards. It also contains two raid controllers, the nvidia one and a SIS controller.
Actually if you look at it I haven't spent 400$ on the raid5 setup, since raid5 uses the capacity of two disks and u loose the capacity of one disk I hardly spent 99$.
But even tho it might not be a big performance gain using raid5 (tho it works pretty smooth), the problem is I AM using it, have data on it and just cant erase the disks, I would need an extra hard disk for the backup.
I think the bottom line is:
you can't use windowsxp and linux dualboot on an fakeraid.
Actually that bothers me because its just something that will pop up more and more.
Considering what I found to be the only solution is using the nvidia mediashield manager to migrate the raid5 to a raid0 or 0+1 and get the third disk out of the array to install linux on that disk. I'm reluctant to do so since Im not willing to risk months of work and data.
Guess only option left is to get an extra hard drive just for installing linux. I wonder, is it really that hard to just recognise an nvidia raid array that you have to go to so much trouble just installing it?