Recovered Read Errors. This shows the number of read errors corrected through physical drive retries during the reference time (phyDrvRefTime). Over time, all disk drives produce these errors. If you notice a rapid increase in the value for Recovered Read Errors (or Hard Read Errors), a problem may exist with the drive. The value increases every time the physical drive detects and corrects another error. Expect more Recovered Read Errors than Hard Read Errors. If you suspect that a problem may exist with the drive, run diagnostics. If the value cannot be determined, 4,294,967,295 is returned.