Glad I found this topic. Having always used WD Reds in my array, I was quite taken back by seeing the raw read error rate values after 1 preclear pass for my brand new 10TB Seagate Exos. But using the Seagate smart calculator it reads as zero errors. Took quite a while to finish 1 pass of preclear (40 hours), I wonder if it is even worth doing two more passes. The drives have a 5 year warranty, you'd hope they would be fine (provided the mailman wasn't using the parcel for soccer practice). Interestingly, I started the preclear on both drives at the same time (both being 10TB), but their raw read error rate raw values differ quite a bit.