EXPLANATION This message should occur only on a down-level computer. Any action to correct the problem should be performed ...

EXPLANATION    This message should occur only on a down-level computer. Any action to correct the problem should be performed on that computer.  The fault-tolerance system found a bad disk sector and rerouted data to a good sector (this is called hotfixing). No data was lost.    ACTION    Run CHKDSK soon to ensure that enough good disk sectors are available for hotfixing.