Abnormal SMART status, but IHM says the drive is healthy

English Storage
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You can do a RAID scrub via GUI too

https://docs.qnap.com/operating-system/qts/4.5.x/en-us/GUID-0BE980D3-1190-486B-A1E8-228DB71A9C93.html

Those FARM values have been in the news recently, as the only indicators for massive mislabelled drive fraud on Seagate drives