Sans Digital MobileRAID MR8UT6G User Manual page 13

3. Replace the defective HDD with a hard disk drive of the same
capacity or bigger (Fig.18)
4. Power on the device (Fig.19).
5. The 8-BAY RAID Enclsoure will start rebuilding the RAID volume
automatically (rebuild speed: approximately 200 GB/hour, depend
on data usage).
Fig.18
Fig.19
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On/off button