Microsoft KB Archive/247858

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CRC Error Message on FAT Media Causes Kernel Stack Overflow

Article ID: 247858

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Server 4.0 Enterprise Edition

This article was previously published under Q247858


Your computer may issue a 0x7F bug check upon receiving a FAT media Cyclic Redundancy Check (CRC) error message.


When Fastfat.sys does not read data from the media because of a CRC error message, Fastfat.sys falls into infinite loop and the kernel stack soon overflows (stop 0x7F).


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
   09/08/99  10:57a   136,560   Fastfat.sys   x86
   09/08/99  10:55a   240,048   Fastfat.sys   Alpha



Microsoft has confirmed that this is a problem in Windows NT 4.0.

Keywords: kbhotfixserver kbqfe kbbug kbfix KB247858