Disk resource does not come online in Windows Server 2012 R2 or Windows Server 2008 R2-based failover cluster

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 R2 Essentials More

This article describes an issue that occurs when a disk resource name contains unauthorized file system characters in a Windows Server 2012 R2 or Windows Server 2008 R2-based failover cluster. A hotfix is available to resolve this issue. The hotfix has a prerequisite.


Consider the following scenario:
  • A disk resource name contains unauthorized file system characters, such as colon (:) or backslash (\), in a Windows Server 2012 R2 or Windows Server 2008 R2-based failover cluster.
  • The disk requires that chkdsk be run.
In this scenario, the chkdsk command doesn't run as expected, and the disk resource can't come online.


The name of the "Physical Disk" resource has an backslash or forward slash character in the resource name. Example: "Disk G:\".

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 website: 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 apply this hotfix, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows Server 2012 R2.Or, install Service Pack 1 for Windows 7 or Windows Server 2008 R2.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.


To work around this issue, rename the cluster disk resource so that it has no characters that are invalid in a file name, such as colon (:), backslash (\), slash (/), asterisk (*), question mark (?), quotation mark ("), left angle bracket (<), right angle bracket (>), or vertical bar (|).

More Information

On Windows Server 2008 R2, the following entries may be logged in the cluster log when the issue occurs and the resource will not come online:
On Windows Server 2012 R2, the resource will come online. However, the chkdsk command will not run. The following event will be logged in the System event log, However, there is no corresponding event from the chkdsk command in the Application event log:


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


See the terminology that Microsoft uses to describe software updates.