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Five year old WD Red 6TB, read errors during parity sync - is it failing? (UNC at LBA)

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I was syncing a new parity drive and not long into this operation one of my oldest drives threw 30 read errors, and another 82 the day after. However the sync completed successfully. I have ran an extended self-test on the drive and it completed without error too. Wondering whether this drive is failing, or perhaps this is because the sync forced a read of a long forgotten part of the disk? (read somewhere this can be a cause of this). I have not run a full parity check for about two months, since changing my schedule to quarterly so perhaps that would have caused this too.


I have a new 18TB drive ready but I'd prefer to keep this disk in the array.


I've attached the latest SMART report. 




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