Oyen Digital DATATALE RS-M4T 4-BAY THUNDERBOLT - Manual (Page 43)

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5. After the Rebuild process is completed, the data in the new hard drive
will replace the damaged or non-functioning hard drive. The RAID Mode
Status should state, “Functional” under RAID Information. Remember to
remove the non-functional Disk(s) before continue using the RAID
System!