Hard Write Errors. This shows the number of write errors that could not be recovered by a physical drive during the reference time (phyDrvRefTime). Over time a disk drive may detect these errors. If you notice an increase in the value shown for Hard Write Errors or Recovered Write Errors, a problem may exist with the drive. The value increases every time the physical drive detects another error. On average, these errors should occur less frequently than read errors. If you see an increase in these errors, schedule server down time to run diagnostics to verify that a problem exists.