Microsoft KB Archive/904564

= An additional system drive letter appears in Windows Explorer after you apply Windows 2000 Update Rollup 1 for Service Pack 4 =

Article ID: 904564

Article Last Modified on 7/26/2006

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APPLIES TO


 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Datacenter Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Service Pack 4

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SYMPTOMS
After you apply Microsoft Windows 2000 Update Rollup 1 for Service Pack 4 (SP4), an additional system drive letter appears in Windows Explorer.

Note This additional drive letter is also known as a ghost drive letter.



CAUSE
This problem occurs because of a change that is made to the Mountmgr.sys file when you apply Windows 2000 Update Rollup 1 for SP4. The hotfix that is described in the following Microsoft Knowledge Base article is included in this rollup:

832097 Drive letters are reassigned after you remove Dell OpenManage Array Manager

This hotfix helps retain non-sequential drive letters that are assigned to volumes. However, on some systems, this hotfix triggers the problem that is described in the &quot;Symptoms&quot; section.



How to obtain the hotfix
This issue is fixed in the Update Rollup 1 for Microsoft Windows 2000 Service Pack 4 (SP4) Hotfix Package version 2. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

891861 Update Rollup 1 for Windows 2000 SP4 and known issues

Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

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

http://support.microsoft.com/contactus/?ws=support

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.

Prerequisites
No prerequisites are required.

Restart requirement
You have to restart the 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 --  15-Aug-2005  17:40  5.0.2195.7063      30,160  Mountmgr.sys 07-Aug-2005 13:43  5.0.2195.7061      21,264  Mountmgrverchk.dll

After you apply this hotfix
After you apply this hotfix, apply the Windows Update Rollup package. If you receive an error when you apply this hotfix, restart the computer.

Before you apply this hotfix, make sure that the following registry subkeys have the correct local paths for the system drive:

If you find a different drive letter from the drive letter in the SystemDrive environment variable, the installation process is unsuccessful. If you find the same drive letter, the installation process is successful.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Keywords: kbfix kbbug kbpubtypekc kbhotfixserver kbqfe KB904564

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