Applies to NetApp SANtricity OS 11.70 Issue Clearing unreadable sectors through the GUI or the E-Series system repairing unreadable sectors on its own, can result in PI guard errors, which in turn res...Applies to NetApp SANtricity OS 11.70 Issue Clearing unreadable sectors through the GUI or the E-Series system repairing unreadable sectors on its own, can result in PI guard errors, which in turn results in drives being failed.