This article has been archived. It is offered "as is" and will no longer be updated.
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows registry
In Windows Home Server, data may not be migrated or duplicated as expected.
This problem may occur if the Drive Extender feature in Windows Home Server is not working correctly. The Drive Extender feature does not work correctly if one of the following conditions is true:
The Defilter.sys file system filter driver is not started.
The Windows Home Server Storage service or the Drive Extender Migrator service is not started.
To resolve this problem, make sure that the Defilter.sys driver, the Windows Home Server Storage service, and the Drive Extender Migrator service are all started. You can do this by performing the procedures in the "Defilter.sys driver" section and in the "Drive Extender Migrator service" section. If these procedures do not resolve the problem, you can try to troubleshoot the problem by viewing the log files that are mentioned in the "Advanced troubleshooting steps" section.
The Defilter.sys driver
Verify that the Defilter.sys driver is started
To verify that the Defilter.sys driver is started, follow these steps:
Click Start, click Run, type cmd, and then press ENTER.
At the command prompt, type the following command, and then press ENTER:
Net Start Defilter
If you receive the following message, go to the "Drive Extender Migrator service" section:
The requested service has already been started.
If you receive a message that the driver could not be started, go to the "How to start the Defilter driver" section.
How to start the Defilter driver
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
Click Start, click Run, type regedit, and then click OK.
In the navigation pane, locate, the following registry key, and then click it: