Dynamic Volume Manager (volmgrx) Service Defaults in Windows 7

Extension of the volume manager driver that manages software RAID volumes (spanned, striped, mirrored, RAID-5) on dynamic disks.

Default Settings

Startup type:Boot
Display name:Dynamic Volume Manager
Service name:volmgrx
Service type:kernel
Error control:critical
Group:System Bus Extender
Path:%SystemRoot%\System32\drivers\volmgrx.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\volmgrx

Default Behavior

Dynamic Volume Manager is a kernel device driver. In Windows 7 it is being loaded by Boot Loader before Kernel initialization. If Dynamic Volume Manager fails to load, Windows 7 attempts to write the error data into Event Log and restart the computer, using the Last Known Good configuration. If the Last Known Good configuration is not valid, Windows 7 startup ends with a Stop error. If you remove or disable the volmgrx service, Windows 7 won't start.

Restore Default Startup Configuration for Dynamic Volume Manager

1. Select your Windows 7 edition and service pack, and then click Download.

2. Save the Win7_volmgrx_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The volmgrx service is using the volmgrx.sys file that is located in the %WinDir%\System32\drivers folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.