This policy detects error message in System Log Detects an error message in the System Log that can result when the Windows ...

                        This policy detects error message in System Log Detects an error message in the System Log that can result when the Windows 2000 disk defragmenter tool does not move a particular data element, and schedules Chkdsk.exe. In this condition, the error is a false positive. There is no loss of data, and, the integrity of the data is not affected.
                        http://support.microsoft.com/kb/885688
                        http://support.microsoft.com/kb/320866