So you buy used enterprise disks because their error detection is 'better'?
Do you have any source for this claim? Why would be the firmware so different? Software is cheap i don't think they would be that different.
I mean a used enterprise disk gets sold after it was running on heavy load for a long time. Any consumer hdd will have a lot less runtime than enterprise disks.
The protocol is better (SAS). Once I put them in, I immediately noticed transmission issues in a counter going up for several of my HDDs where the SATA showed no errors at all. It was a faulty backplane that introduced these transmission issues that went unnoticed by my SATA drives for several years.