Asus PCI-DA2200 User Manual page 299

ASUS GUI RAID Manager: Array Management
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."
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4.16 Dynamic Logical Drive Expansion