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
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 of Dynamic Volume Manager

1. Run the Command Prompt as an administrator.

2. Copy the commands below, paste them into the command window and press ENTER:

sc config volmgrx start= boot
sc start volmgrx

3. Close the command window and restart the computer.

The volmgrx service is using the volmgrx.sys file that is located in the C:\Windows\System32\drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 7 installation media.