Sans Digital Towerraid TR4UT-B - R3 MODE WITH HOT SPARE

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3. Press and hold the recessed SETUP BUTTON.
4. Turn on the power than release the SETUP BUTTON to complete mode setting.
4.6.10 R3 MODE WITH HOT SPARE
The R3 MODE storage policy with hotspare drive requires a minimum of 4 drives to implement.
1. Turn off the power.
2. Insert 3 drives in order from the top to the bottom.