Asus PCI-DA2200 User Manual page 90

Before the logical drive can be expanded, a SCSI drive (or drives)
must be added and scanned in (See section 8.4.1 for details on
scanning in a SCSI drive). Use the arrow keys to select "Add SCSI
Drives," and then press [Enter]. SCSI drives that are available for
'adding' will be displayed. Select drives by highlighting them and
then pressing [Enter]. An asterisk *] is displayed by each drive
[
selected. When you are finished selecting, press [Esc] to confirm.
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ASUS PCI-DA2200 User's Manual