You cannot restore mirroring for the boot partition on some GPT disks in Windows Server 2008 if you follow the instructions in Knowledge Base article 951985

This article has been archived. It is offered "as is" and will no longer be updated.
Consider the following scenario:
  • You set up software mirroring for the boot partition on some GUID partition table (GPT) disks in Windows Server 2008 by following the instructions described in Microsoft Knowledge Base (KB) article 951985.
  • One of the mirrored boot partition disks fails. Therefore, you replace the failed disk and try to restore mirroring for the boot partition.
  • You try to configure a secondary boot manager entry for the new disk as described in the "Reestablish the primary boot drive mirror" section.
In this scenario, the boot entries in the Extensible Firmware Interface (EFI) nonvolatile RAM (NVRAM) become invalid. Therefore, mirroring is not restored for the boot partition.

Hotfix information

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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.


No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The global version of this hotfix has the file attributes (or later file attributes) that are listed in the following table.

Windows Vista and Windows Server 2008 file information notes

  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    VersionProductSR_LevelService branch
    6.0.6000.16xxxWindows VistaRTMGDR
    6.0.6000.20xxxWindows VistaRTMLDR
    6.0.6001.18xxxWindows Vista and Windows Server 2008SP1GDR
    6.0.6001.22xxxWindows Vista and Windows Server 2008SP1LDR
    6.0.6002.18xxxWindows Vista and Windows Server 2008SP2GDR
    6.0.6002.22xxxWindows Vista and Windows Server 2008SP2LDR
  • Service Pack 1 is integrated into the original release of Windows Server 2008.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately. The MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.
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 item in Control Panel.
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
For all supported Itanium-based versions of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For more information about how to set up boot partition mirroring on GPT disks, click the following article number to view the article in the Microsoft Knowledge Base:
951985 How to set up dynamic boot partition mirroring on GUID partition table (GPT) disks in Windows Server 2008
For more information about software update terminology, 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

Additional file information for Windows Server 2008

Additional files for all supported x64-based versions of Windows Server 2008 and of Windows Vista

File nameFile versionFile sizeDateTimePlatform
Amd64_microsoft-windows-b..iondata-cmdlinetool_31bf3856ad364e35_6.0.6001.22455_none_e4a22c9c76cab328.manifestNot Applicable4,34123-Jun-200913:54Not Applicable
Amd64_microsoft-windows-b..iondata-cmdlinetool_31bf3856ad364e35_6.0.6002.22156_none_e6899ece73f021a3.manifestNot Applicable4,34123-Jun-200913:15Not Applicable
Amd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6001.22455_none_c8a7917785c22545.manifestNot Applicable16,51223-Jun-200913:54Not Applicable
Amd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6002.22156_none_ca8f03a982e793c0.manifestNot Applicable16,51223-Jun-200913:15Not Applicable
Package_for_kb970686_client_1~31bf3856ad364e35~amd64~~ Applicable1,37524-Jun-200905:46Not Applicable
Package_for_kb970686_client_2~31bf3856ad364e35~amd64~~ Applicable1,98324-Jun-200905:46Not Applicable
Package_for_kb970686_client~31bf3856ad364e35~amd64~~ Applicable1,72324-Jun-200905:46Not Applicable
Package_for_kb970686_sc_0~31bf3856ad364e35~amd64~~ Applicable1,43024-Jun-200905:46Not Applicable
Package_for_kb970686_sc_1~31bf3856ad364e35~amd64~~ Applicable1,98024-Jun-200905:46Not Applicable
Package_for_kb970686_sc~31bf3856ad364e35~amd64~~ Applicable1,71124-Jun-200905:46Not Applicable
Package_for_kb970686_server_0~31bf3856ad364e35~amd64~~ Applicable1,43324-Jun-200905:46Not Applicable
Package_for_kb970686_server_1~31bf3856ad364e35~amd64~~ Applicable1,98324-Jun-200905:46Not Applicable
Package_for_kb970686_server~31bf3856ad364e35~amd64~~ Applicable1,72324-Jun-200905:46Not Applicable
Package_for_kb970686_winpesrv_0~31bf3856ad364e35~amd64~~ Applicable1,43024-Jun-200905:46Not Applicable
Package_for_kb970686_winpesrv~31bf3856ad364e35~amd64~~ Applicable1,43824-Jun-200905:46Not Applicable

Additional files for all supported Itanium-based versions of Windows Server 2008

File nameFile versionFile sizeDateTimePlatform
Ia64_microsoft-windows-b..iondata-cmdlinetool_31bf3856ad364e35_6.0.6001.22455_none_8885350ebe6b4aee.manifestNot Applicable4,33423-Jun-200913:15Not Applicable
Ia64_microsoft-windows-b..iondata-cmdlinetool_31bf3856ad364e35_6.0.6002.22156_none_8a6ca740bb90b969.manifestNot Applicable4,33423-Jun-200912:44Not Applicable
Ia64_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6001.22455_none_6c8a99e9cd62bd0b.manifestNot Applicable16,81923-Jun-200913:15Not Applicable
Ia64_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6002.22156_none_6e720c1bca882b86.manifestNot Applicable16,81923-Jun-200912:44Not Applicable
Package_for_kb970686_sc_0~31bf3856ad364e35~ia64~~ Applicable1,42524-Jun-200905:46Not Applicable
Package_for_kb970686_sc_1~31bf3856ad364e35~ia64~~ Applicable1,80624-Jun-200905:46Not Applicable
Package_for_kb970686_sc~31bf3856ad364e35~ia64~~ Applicable1,70624-Jun-200905:46Not Applicable
Package_for_kb970686_server_0~31bf3856ad364e35~ia64~~ Applicable1,42924-Jun-200905:46Not Applicable
Package_for_kb970686_server_1~31bf3856ad364e35~ia64~~ Applicable1,81024-Jun-200905:46Not Applicable
Package_for_kb970686_server~31bf3856ad364e35~ia64~~ Applicable1,71824-Jun-200905:46Not Applicable
Package_for_kb970686_winpesrv_0~31bf3856ad364e35~ia64~~ Applicable1,42624-Jun-200905:46Not Applicable
Package_for_kb970686_winpesrv~31bf3856ad364e35~ia64~~ Applicable1,43424-Jun-200905:46Not Applicable
recovering from a failure of a software mirrored GPT disk in Windows Server 2008

Article ID: 970686 - Last Review: 01/16/2015 17:17:03 - Revision: 2.0

Windows Server 2008 Standard, Windows Server 2008 Enterprise, Windows Server 2008 Datacenter, Windows Server 2008 Datacenter without Hyper-V, Windows Server 2008 Enterprise without Hyper-V, Windows Server 2008 for Itanium-Based Systems, Windows Server 2008 Standard without Hyper-V

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