Microsoft KB Archive/246026

= Cannot Delete or Repair Corrupted File on NTFS Volume =

Article ID: 246026

Article Last Modified on 3/2/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Datacenter Server
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q246026



SYMPTOMS
When you try to delete a file on an NTFS volume, you may receive the following error message:

Cannot delete : The file or directory is corrupt and unreadable.

The System event log in Windows NT 4.0 contains the following message:

Event ID: 41

Source: Diskperf

Description: The file system structure on disk is corrupt and unreadable. Please run the chkdsk utility on the device with label "Volume_name"

The System event log in Windows 2000 contains the following message:

Event ID: 55

Source: NTFS

Description: The file system structure on disk is corrupt and unusable. Please run the chkdsk utility on the volume "Drive_letter:"

If you run Chkdsk against the volume, Chkdsk may or may not make repairs, but afterwards you still cannot delete the corrupted file.



CAUSE
This behavior can occur if the NTFS volumes' Master File Table (MFT) is corrupted. The short and long file name pairs that are stored in the directory index record and the file names that are stored in the associated File Record Segment (FRS) contain case-sensitive characters that do not match.

NTFS supports case-sensitive (POSIX) file names, but Chkdsk does not check file names in case-sensitive mode.

For example, assume that the directory index record has a BADFILe.TXT entry but the FRS has a BADFILE.TXT entry for the file name. NTFS views this as being invalid or corrupted, but Chkdsk compares only the names and ignores the case. It does not make repairs.



RESOLUTION
To resolve this issue, back up the volume that contains the corrupted file(s) and exclude the corrupted file(s) from the backup job. Reformat the volume, and then restore from the backup.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base:

120716 How to Remove Files with Reserved Names in Windows NT

176646 Error Message: The File or Directory Is Corrupt...

Additional query words: FRS NTFRS corruption

Keywords: kberrmsg kbprb KB246026

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