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RAID arrays created on legacy ShareCenters (DNS-321/323/345) are not transferable to the newer...
Addressing your question, If a HDD fails in a RAID-5 array, both the DNS-343 and DNS-345 should successfully rebuild without issue. The DNS-345 has matured quite a bit since the legacy DNS-343. You can always perform some simulated failures with the DNS-345 to see how the unit behaves:Create a RAID-5 array in the DNS-345 and copy some data overPower down the DNS-345Remove one of the HDDs and reformat in a Windows PCRe-seat the HDD and power-up the DNS-345The DNS-345 should repair the arrayand/orCreate a RAID-5 array in the DNS-345 and copy some data overPower down the DNS-345Remove one of the HDDspower-up the DNS-345The DNS-345 should prompt for a new HDD and rebuild the array