Note that all the manufacturers aren&#x27;t actually saying the URE is X. They are saying it&#x27;s less than X, it&#x27;s a cap. Therefore it isn&#x27;t a rate. The actual rate for two drives could be very different, maybe even more than an order of magnitude different, but so long as it&#x27;s below the spec&#x27;s cap for such errors, it&#x27;s considered normal operation.<p>So yeah, I agree, the whole idea in some circles that you <i>will</i> get a URE every ~12TB of data read is obviously b.s. We don&#x27;t know what the real world rate is because of that little less than sign that appears in all of these specs. We only know there won&#x27;t be more errors than that, and not for a specific drive, but rather across a (virtual) sample size for that make&#x2F;model of drive.