Oyen Digital DATATALE RC-M4QJ 4-BAY RAID - Manual (Page 67)

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The rebuilding state status will reflect on the bottom of the RAID MASTER
Menu.
The Rebuild Speed of the USB 2.0 Model is 200 GB per hour or 56.88 MB
per second, approximately. When the chipset is processing the Rebuild task, if
data is accessed during this period, the speed of data access is depends on
priority setting under Advanced Mode Menu; thus, access of the hard drive
during a Rebuild is not recommended.
Even if the RAID System loses connection to the host, the rebuild continues.
If the RAID System is powered off, the RAID System will retain the rebuild status
in memory. When the RAID System is powered “on” again, the rebuild process
will resume from the previous status.
Under USB 2.0 connection, a warning notice indicating that the device has
not been safely removed when the hard drive is replaced may interrupt the
rebuilding process. Please ignore the warning and continue the rebuilding
process.