> If this were the case, forums would be filled to the brim with ZFS users whinging about how they get CKSUM errors practically every time they scrubbed their pools. They do happen, but nothing like that frequently.

I'm going by what the manufacturers say - are you saying they are overestimating the error rate? Why would they do that?

> They were never such devices in the first place

No, I meant they would return false data instead of an error. Used to be you never got corruption, just success or fail. Now you have success, false success, or fail.