SMB 1.x MiniRedirector (mrxsmb10) Service Defaults in Windows 7

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

Default Settings

Startup type: Manual
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

SMB 1.x MiniRedirector is a file system driver. In Windows 7 it won't be started if the user doesn't start it. If SMB 1.x MiniRedirector fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the mrxsmb10 service is not running because of the error.


SMB 1.x MiniRedirector is unable to start, if the SMB MiniRedirector Wrapper and Engine service is stopped or disabled.

If SMB 1.x MiniRedirector is stopped, the Workstation service fails to start and initialize.

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. Copy the command below, paste it into the command window and press ENTER:

sc config mrxsmb10 start= demand

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 7 installation media.