Having the WD drive on the RAID controller running RAID 0 isn't going to hurt anything.
RAID 0 (known as "striping") basically links each drive in the array as one huge drive. Storage capacity is determined by the smallest drive in the array. That capacity is then applied to format all other drives in the array. If using a 4GB, 6GB, 5GB drive in a RAID 0 array, your system will see one huge drive of 12GB (4GB x 3) versus 15GB. RAID 0 offers double or more performance under sustained data transfers when one drive per IDE port is used. In such a configuration, unlike SCSI, IDE drives are always available to the system. SCSI requires more management of the SCSI bus.
Lars Coleman