Keep in mind that the MG series is an enterprise class HDD. They expect you to have proper cooling like in a Datacenter to cool your HDDs. I think this is the reason they set the max temperature so low
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Just received a 20TB return for my latest 18TB RMA. Can’t wait to have them all replaced. 
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Didn’t that exchange cost you a node, when the 18TB died?
I am replacing the disks when I see first pending or uncorrectable sectors. So far no node was lost, some missing piece files out of millions don’t matter.
Ok, then I understand you are happy with the exchange 