You may receive a Stop error message when you unexpectedly remove a logical unit number (LUN) from a Windows 2000 Server-based computer

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When you unexpectedly remove a logical unit number (LUN) from a Microsoft Windows 2000 Server-based computer, you may receive the following Stop error message:
Bugcheck 0xd1


An attempt was made to access a pageable (or completely invalid) address at an interrupt request level (IRQL) that is too high. This is usually caused by drivers using improper addresses.
This Stop error may have the following arguments:
  • Arg1: b7b81fe8, memory referenced
  • Arg2: 00000002, IRQL
  • Arg3: 00000000, value 0 = read operation, 1 = write operation
  • Arg4: bff4d3c5, address which referenced memory
This problem occurs because of a bug in the disk class driver.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To install this hotfix, you must have Windows 2000 Service Pack 2 (SP2) or a later Windows 2000 service pack installed on your computer.

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date         Time   Version            Size    File name   --------------------------------------------------------------   14-Apr-2003  20:53  5.0.2195.6736      35,856  Classpnp.sys   29-May-2003  16:25  5.0.2195.6749      30,768  Disk.sys
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
824684 Description of the standard terminology that is used to describe Microsoft software updates

Article ID: 822000 - Last Review: 11/02/2013 16:30:00 - Revision: 3.0

  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • kbnosurvey kbarchive kbautohotfix kbhotfixserver kbqfe kbbug kbfix kbwin2000presp5fix KB822000