This policy detects a failed I/O request error message in the system log. This could be the result of a variety of things, ...

                        This policy detects a failed I/O request error message in the system log. This could be the result of a variety of things, including a firmware bug or faulty SCSI cables.
                        http://support.microsoft.com/kb/311081
                        http://support.microsoft.com/kb/885688