Asus PCI-DA2200 User Manual page 39

From the menu, select Partition Logical Drive. You will see that the
1800MB logical drive is composed of two 900MB partitions.
Follow the directions in section 8.3.1 to map the new partition to a
Host LUN. The new partition must be mapped to a host LUN in
order for the HBA (host-bus adapter) to see it. Once you have
mapped the partition, reboot Windows NT. The HBA should be able
to detect an additional "disk."
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ASUS PCI-DA2200 User's Manual