Asus TS300-PA4 - Manual (Page 170)

6-42 Chapter 6: RAID configuration
3. Select RAID-10 (Fault Tolerance, High Performance) from the Select RAID
Type menu, then press <Enter>.
4. Use the arrow keys to select a RAID set member, then press
<SpaceBar> to mark. An X mark appears after the selected HDD.
5. Follow the step 4 to select the other members of the RAID set, then press
<Enter> when finished.
Refer to the Striping/Mirroring Requirements note at the bottom of the screen
to determine the number of hard disk drives required for the selected RAID type.