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

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4. Turn on the power than release the SETUP BUTTON to complete mode setting.
4.6.7 R1 MODE WITH HOT SPARE
1. Turn off the power.
2. Insert 3 drives in order from the top to the bottom.
3. Set the MODE SWITCH position to R1/R10.
4. Press and hold the recessed SETUP BUTTON.