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# ScanDisk Reports Undo Floppy Is Damaged

Article ID: 108603

Article Last Modified on 10/27/2000

APPLIES TO

- Microsoft MS-DOS 6.2 Standard Edition
- Microsoft MS-DOS 6.21 Standard Edition
- Microsoft MS-DOS 6.22 Standard Edition

This article was previously published under Q108603

## SYMPTOMS

Running SCANDISK /UNDO results in the following error message:
The Undo information on the disk in drive A is damaged and cannot be retrieved.
To undo changes that ScanDisk made previously, insert an Undo disk in drive A, and then choose Try Again. If the Undo disk you want does not fit in drive A, insert the disk in the appropriate drive, and then restart ScanDisk by specifying the /UNDO switch and the appropriate drive letter (for example, SCANDISK /UNDO A:).
If you do not want to undo ScanDisk's changes, choose Exit.

## CAUSE

This error occurs when the SCANUNDO.DAT file on the Undo disk has a read- only attribute, which ScanDisk attempts to clear before opening the file. Because the disk is write-protected, attempting to change the attribute fails and results in the above error.

## RESOLUTION

Since ScanDisk needs to change the read-only attribute on the Undo disk, first verify that the disk is not write protected. If it is write- protected, remove the write-protect tab or slide the write-protect tab to the closed position, then try running SCANDISK /UNDO again. If the disk is not write-protected, the disk may be damaged. Run SCANDISK on the Undo disk to try to correct any problems on the floppy disk.

Additional query words: 6.22 6.20 scandisk scan disk undo win95

Keywords: KB108603