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.  An error occurred during an operation on the listed disk because of problems with the disk. The operation probably did not succeed.    ACTION    Retry the operation. If the problem persists and you are unable to recover data from the disk, use backups of the affected files, if you have any.