Asus PCI-DA2200 - Manual (Page 299)

ASUS GUI RAID Manager: Array Management
4-48 4.16 Dynamic Logical Drive Expansion
Logical Drive E: is now composed of two 900MB partitions
with a total volume of 1800MB. To see this, hold down on
the <Ctrl> key and select both Disk 1 and Disk2; then
right-click your mouse and select "Properties."