In the BIOS configuration utility for the PERC. RAID array = Virtual Disk on the PERC. Go to CTRL-R and setup the array again, Initializing it this time, and giving it a 10-minute head start on installing Windows. Do not "partition" your array in the PERC BIOS - use Windows to create your partitions. Once you boot to the install disk, then you can partition it however you want.