SMB 1.x MiniRedirector (mrxsmb10) Service Defaults in Windows 8

Implements the SMB 1.x (CIFS) protocol. This protocol provides connectivity to network resources on pre-Windows Vista servers.

Default Settings

Startup type:
Windows 8 CoreManual
Windows 8 ProManual
Windows 8 EnterpriseManual
Windows 8.1 CoreAutomatic
Windows 8.1 ProAutomatic
Windows 8.1 EnterpriseAutomatic
Windows 8.1 Update 1 CoreAutomatic
Windows 8.1 Update 1 ProAutomatic
Windows 8.1 Update 1 EnterpriseAutomatic
Display name:SMB 1.x MiniRedirector
Service name:mrxsmb10
Service type:filesys
Error control:normal
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\mrxsmb10

Default Behavior

The SMB 1.x MiniRedirector service is a file system driver. It will not be started until the user starts it in all editions of Windows 8. This service is starting automatically during the operating system startup in all editions of Windows 8.1, Windows 8.1 Update 1.

If SMB 1.x MiniRedirector fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the mrxsmb10 service hasn't been started.


SMB 1.x MiniRedirector can't start, if the SMB MiniRedirector Wrapper and Engine service is disabled or not available.

All the services listed below will not start if SMB 1.x MiniRedirector is disabled:

Restore Default Startup Configuration of SMB 1.x MiniRedirector

Before you begin doing this, make sure that all the services on which SMB 1.x MiniRedirector depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt as an administrator.

2. Depending on the version of your operating system, copy the commands below, paste them into the command window and press ENTER.

For Windows 8 Core, Windows 8 Pro, Windows 8 Enterprise:
sc config mrxsmb10 start= demand

For Windows 8.1 Core, Windows 8.1 Pro, Windows 8.1 Enterprise, Windows 8.1 Update 1 Core, Windows 8.1 Update 1 Pro, Windows 8.1 Update 1 Enterprise:
sc config mrxsmb10 start= auto
sc start mrxsmb10

3. Close the command window and restart the computer.

The mrxsmb10 service is using the mrxsmb10.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 8 installation media.