Asus PCI-DA2200 User Manual page 95

A list of LUNs and their respective mappings will be displayed on
the screen. To map a LUN to a logical drive's partition, select an
available LUN (one not mapped yet) by moving the cursor bar to the
LUN, then pressing [Enter].
A list of available logical drives will be displayed on the screen.
Move the cursor bar to the desired logical drive, then press [Enter].
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ASUS PCI-DA2200 User's Manual