Installation failed at Promise FastTrack TX4310


I tried to install OpenSUSE 11.1 at my Computer with a RAID-Controller. It is the Promise FastTrack TX4310. I want to install OpenSUSE as a second OS. The first OS is Windows XP Professional 64bit Edition. But when I start the Installation the Installation-Program, it tells me that it cannot modify the Partion. Can anyone help me?