To run Software RAID, you need to convert this drive to a Dynamic Disk. Note that on Windows Server 2003 this is possible after installing the disk as Basic. To convert to a Dynamic Disk, simply right-click on the drive and select Convert to Dynamic Disk:
Check the disk you wish to convert:
Confirm which disks you want to convert to Dynamic:
You will be warned that converting this disk drive will limit the ability of other operating systmes to start for any volumes on the disk.