For anyone still doubting WD is at fault here, as I was (because I thought these were obviously inferior drives not appropriate for RAID or 24/7 operation), jus

For anyone still doubting WD is at fault here, as I was (because I thought these were obviously inferior drives not appropriate for RAID or 24/7 operation), just look at the product page [1] which is still, as of Fri 29 May 13:50:16 UTC 2020, claiming that WD Red drives are "Built for NAS compatibility" and "Designed for RAID environments". [1] https://www.westerndigital.com/products/internal-drives/wd-red-hdd https://www.westerndigital.com/products/internal-drives/wd-r... If some Red drives (most probably the SMR ones) require many day rebuild times or even fail to rebuild in common commercial consumer NAS solutions, they are obviously not viable for RAID environments and then WD is guilty of false advertising.