Asus PCI-DA2200 - Manual (Page 282)

ASUS GUI RAID Manager: Array Management
4.12 Creating and Deleting Partitions 4-31
4. Select Delete Partition.
5. Repeat the same procedure to delete the other unwanted
partitions.
6. After deleting partitions, double-click the right mouse button
on the current logical volume.
7. From the displayed menu, select Partition. Then, select Set
Partition.