Asus RS160-E4/PA4 - Manual (Page 120)

6-6 Chapter 6: RAID configuration
4. Select all the drives required for the RAID set, then press <Enter>.
The configurable array appears on screen.
3. The ARRAY.SELECTION.MENU displays the available drives connected to
the SATA ports. Select the drives you want to include in the RAID set, then
press <SpaceBar>. When selected, the drive indicator changes from READY
to ONLIN.A[X]-[Y], where X is the array number, and Y is the drive number.
The information of the selected hard disk drive displays at the bottom of the
screen.