I think I found the thread you were mentioning …
Today was monthly scrub day for my HDD pool which is a 5x 4TB IronWolf RAIDZ1.
And today I got several “ATA errors” during the scrub e.g.
Device: /dev/sda [SAT], ATA error count increased from 1 to 2.
2025-05-17 11:26:14 (Europe/Lisbon)
I didn’t initially realise that these happened during a scrub (suggesting bitrot), so I started another scrub before I realised this.
So how worried should I be by this small number of (recovered) scrub errors?
He has IronWolf, I have WD. I am seeing some WRITE errors, he is only showing read errors. I wasn’t doing anything special (scrub, resliver, long SMART test).
I will run CLEAR against them and monitor.
