I have a Synology DiskStation. It used to contain 3xTB drives, I now have 2xTB, 2x8TB drives. The old drives were "Seagate NAS" drives, the new ones are from the same(?) series, named "Ironwolf".
The old drives both list G_Sense_Error_Rate at 0. The new ones are now at ~800 and slowly climbing.
Why would they differ (in the same enclosure)? Is there something I can do to stop it from increasing?