Oyen Digital DATATALE RS-M4T 4-BAY THUNDERBOLT - Manual (Page 54)

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HYPERDUO (Capacity and Safe)
The HyperDuo feature allows only one (1) hard drive, and can support at least
one (1) up to three (3) additional solid-state drives. It has two RAID modes:
Capacity Mode and Safe Mode.
The Capacity Mode provides maximum capacity available by combining both the
SSD(s) and hard drive, while performing at SSD speeds, unless all the SSD(s)
are full. Under Capacity Mode, data is striped into all the SSD(s). Then, if the
SSD(s) are full, additional data is stored via Span into the hard drive and
performance speeds are decreased. The total volume available is based on all
the SSD(s) and hard drive combined. If either the hard drive or SSD(s) becomes
defective, all data will be lost.
The Safe Mode provides optimal data protection without affecting data read
speeds, but data write speeds are decreased for maximum resiliency. Under
Safe Mode, data is striped into all the SSD(s), and at the same time, the same
data is mirrored into the hard drive. Then, if the SSD(s) are full, additional data is
stored via Span into the hard drive. The total volume available is based on the
hard drive alone. If any or all the SSD(s) becomes defective but the hard drive is
still functional, the original and identical backed up data is available offhand.
However, if the hard drive becomes defective, all data will be lost.