Partition Manager (partmgr) Service Defaults in Windows 7
Disk class filter driver that auctions out partitions to volume managers.
Default Settings
| Startup type: | Boot |
| Display name: | Partition Manager |
| Service name: | partmgr |
| Service type: | kernel |
| Error control: | critical |
| Group: | Boot Bus Extender |
| Path: | %SystemRoot%\System32\drivers\partmgr.sys |
| Registry key: | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\partmgr |
Default Behavior
Partition Manager is a kernel device driver. In Windows 7 it is being loaded by Boot Loader before Kernel initialization. If Partition 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 partmgr service, Windows 7 won't start.
Restore Default Startup Configuration of Partition 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 partmgr start= boot
sc start partmgr
3. Close the command window and restart the computer.
The partmgr service is using the partmgr.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.