Asus Motherboard P5MT-S - Manual (Page 145)

ASUS P5MT-S 5-45
5. The screen displays the information on the added spare drive.
Press <Esc> to exit the utility.
5.4.7 Deleting a RAID 10 set spare drive
To delete a RAID 10 set spare drive:
1. From the utility main menu, press <S>, select Delete Spare from the
Options menu, then press <Enter>.