Error Message:

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drive letter is dirty. You may use the /C option to schedule chkdsk for this drive.

Explanation:

Chkdsk or NTFS has found that the specified volume or disk drive is dirty. That is, data corruption may have occurred because of an improper shutdown of the system.

User Action:

For an NTFS volume, run the chkntfs from the command using the /C option. The /C option will schedule chkdsk to be run at the next reboot. You can also enter chkdsk at the command line prompt and specify the drive the volume resides on. If you chose to run chkdsk from the command line prompt, use the /f option to fix any problems on the volume. chkdsk can be used to verify and fix problems on both NTFS and FAT volumes. If you use chkdsk on an NTFS volume and you get an error message that says, "cannot lock volume". Run chkntfs from the command line with the /c option. Then reboot the system.