RAISBECK
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RAISBECK's post in Disc Read Errors While Performing Initial Parity-Sync was marked as the answerDisk was not Ok. It generated errors on three different attempts to sync parity (bad sectors being reported) - even though SMART said it was fine.
When I took the disk out, I noticed the small plastic L part of the SATA power port was broken off (circled below):
It came like this - it was brand new. Perhaps this made the power supply to the drive unstable - the contacts might not have been fully in place.
I replaced it with a Toshiba N300 (which is a CMR vs the SMR WD Red drives) - which I am now using as the parity drive (due to CMR being superior for the frequent disc writing)... zero issues overnight syncing parity.
Just bought my Unraid license - this software saved me 150 bucks by detecting the problems with that new 6 TB disk. I'm very happy.
Thanks for your help.