Asus M3A78-EMH HDMI - Manual (Page 73)

Chapter 5: Monitor and Manage
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Or, to use the maximum capacity of the physical drives, check the Use
Maximum Capacity box.
For RAID Ready and JBOD, the system will check the Use Maximum
Capacity Box automatically.
7. Click the physical drives to select them.
Available drives have a white frame. Selected drives have a red frame.
For RAID Ready, select only one physical drive.
8. Click the Next button.
The Assign a Name screen appears.
9. Enter a name for the logical drive in the field provided.