Oyen Digital DATATALE RS-M4T 4-BAY THUNDERBOLT - Manual (Page 51)

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REBUILD
The RAID MASTER’s Rebuild feature is available manually under RAID 1 and
RAID 1+0. If one of the existing RAID Set becomes “degraded”, functional hard
drive can be inserted to Rebuild and recover the data within the degraded/broken
RAID Set. However, recovery of the data/RAID Set depends on each situation
(RAID Mode, number of “non-functional” Disks, etc).
The use of identical hard drive/SSDs from the same manufacturer, having the
same capacity and RPM is highly recommended.
Please read the "REBUILD: …" section under “RAID MASTER: OPERATION”
for more information.
RAID MODES
A Redundant Array of Independent (or Inexpensive) Disks (RAID) is a system
that utilizes multiple hard drive/SSDs to share or replicate data among the hard
drive/SSDs. The benefit, depending on the selected RAID Mode (combinations
of disks), is one or more of increased data integrity, fault-tolerance, throughput or
capacity as a single drive when compared to individual hard drive/SSDs.
Any RAID mode changes or deletions will erase all the existing data inside the
hard drive/SSD. It is highly recommended to save all existing data to another
hard drive/SSD before performing any RAID mode changes or deletions.
Using identical hard drive/SSDs with the same capacity and RPM, and from
the same manufacturer are highly recommended for best performances.