cpqDaPhyDrvThrRecvReadErrs is the factory-set maximum threshold for recovered read errors on a physical drive during its reference time window, corresponding to the cpqDaPhyDrvRecvReadErrs counter. Because some recovered read errors are normal over a drive's life, this threshold defines the point at which the rate becomes abnormal enough to flag. For example, an admin would treat a drive whose recovered read errors cross this threshold as needing closer inspection even though the errors were all successfully corrected.