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Please be aware of an ongoing scandal with Western Digital secretly swapping out the underlying tech from PMR to SMR. Drives with SMR are slower at writing and will FAIL rebuilding a cluster of non SMR drives. Western Digital tried to cover this up and hide the truth. Some of the other HD vendors are guilty of the same, however WD applied this to their NAS drives which is not just deceiving, it will actually cause failures in your NAS. You can do a web search for this, there a plenty of websites reporting this backed with all the technical information.