Microsoft UIO Mapper Driver Service (uiomap) Defaults in Windows 11

Usermode IO Mapper Driver by Microsoft Corporation.

The Microsoft UIO Mapper Driver Service exists only in:

Default Settings

Startup type: System
Display name:Microsoft UIO Mapper Driver Service
Service name:uiomap
Service type:kernel
Error control:normal
Group:Base
Path:%SystemRoot%\System32\DriverStore\FileRepository\uiomap.inf_amd64_11efbd9b4c5f482e\uiomap.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\uiomap

Default Behavior

Microsoft UIO Mapper Driver Service is a kernel driver. In Windows 11 it starts at Kernel initialization. If Microsoft UIO Mapper Driver Service fails to start, the failure details will be recorded into Event Log. Then Windows 11 should boot up and notify the user about the uiomap service startup failure.

Restore Default Startup Configuration of Microsoft UIO Mapper Driver Service

1. Run the Command Prompt as an administrator.

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

sc config uiomap start= system
sc start uiomap

3. Close the command window and restart the computer.

The uiomap service is using the uiomap.sys file that is located in the C:\Windows\System32\DriverStore\FileRepository\uiomap.inf_amd64_11efbd9b4c5f482e directory. If the file is removed or corrupted, read this article to restore its original version from Windows 11 installation media.