Microsoft KB Archive/247065

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Error Message: System Process Lost Delayed-Write Data

Article ID: 247065

Article Last Modified on 11/1/2006


  • Microsoft Windows NT 4.0 Service Pack 6a
  • Microsoft Windows NT Server 4.0 Enterprise Edition
  • Microsoft Windows NT 4.0 Service Pack 6

This article was previously published under Q247065


When you take a cluster disk offline, or move the group to the other node, you may receive the following error message:

"System Process - Lost Delayed-Write Data"

"The system was attempting to transfer file data from buffers to \Device\Harddisk#\Partition#\. The write operation failed, and only some of the data may have been written to the file.


With certain disk layouts, e.g. additional RAW partitions, the partition is not properly unmounted before the disk is taken offline.


A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English-language version of this fix should have the following file attributes or later:

   Date      Time    Size    File name     Platform
   12/02/99  11:35a  29,712  clusdisk.sys  i386
   12/02/99  11:33a  49,744  clusdisk.sys  Alpha


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

Additional query words: MSCS Event ID: 26

Keywords: kbhotfixserver kbqfe kbbug kberrmsg kbfix KB247065