Acer HDS AMS200 Reference Manual page 155

7. Click Set. The Spare Drives dialog box displays:
8. Select the HDU that you want to set as a spare drive from the Available Drives list and
click the button.
The selected HDU is moved to the Drives to Set list:
9. Click OK.
10. A message indicating that the setting is complete displays. Click OK.
Acer | HDS AMS200 User and Reference Guide 135