Assume that you have a computer that has Windows 8.1, Windows Server 2012 R2,Windows 8, or Windows Server 2012 installed, and you are connected to a server share across a SMB2 link that does not support resiliency. Resiliency is an optional feature beginning with SMB 2.1 and some SMB2 implementations do not support resiliency. Then, you experience one of the following issues:
- When you use Windows Server Backup, you receive the following error message: Backup failed to complete. There was a failure in preparing the backup image.
- When you use Hyper-V manager to create a VHD or VHDX, you receive the following error message: The filename \\<system>\<share>\New Virtual Hard Disk.vhdx is reserved for use by Windows.
- When you try to mount an .ISO image by right-clicking on the .ISO file in Explorer and select mount from the right-click menu, you receive the following error message: sorry there was a problem mounting the file.
- When you use the Win32 API, CreateVirtualDisk() fails.
To resolve this issue for Windows 8.1 or Windows Server 2012 R2, install update rollup 2919355. For more information about how to obtain update rollup 2919355, click the following article number to view the article in the Microsoft Knowledge Base:
2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014To resolve this issue for Windows 8 or Windows Server 2012, install the hotfix that is described in this article.
Hotfix informationA 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.
PrerequisitesTo apply this hotfix, you must be running Windows 8.1, Windows Server 2012 R2, Windows 8, or Windows Server 2012.
Registry informationTo use the hotfix in this package, you do not have to make any changes to the registry.
Restart requirementYou must restart the computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace a previously released hotfix.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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 updatesThe following scenarios continue to be blocked
- Running a virtual machine (VM) provisioned on a non-resilient SMB share.
- Storage migration to a non-resilient SMB share.
- Live migration, with storage being moved to a non-resilient SMB share.
- Virtual machine (VM) replication to a non-resilient SMB share that uses Hyper-v Replica.