Link-Layer Topology Discovery Mapper I/O Driver (lltdio) Service Defaults in Windows 7

Link-Layer Topology Mapper I/O Driver by Microsoft Corporation.

Default Settings

Startup type:Automatic
Display name:Link-Layer Topology Discovery Mapper I/O Driver
Service name:lltdio
Service type:kernel
Error control:normal
Group:NDIS
Path:%SystemRoot%\system32\DRIVERS\lltdio.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lltdio

Default Behavior

Link-Layer Topology Discovery Mapper I/O Driver is a kernel device driver. In Windows 7 it is starting automatically on the operating system startup. If Link-Layer Topology Discovery Mapper I/O Driver 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 lltdio service is not running because of the error.

Dependencies

If Link-Layer Topology Discovery Mapper I/O Driver is stopped, the following services cannot start:

Restore Default Startup Configuration for Link-Layer Topology Discovery Mapper I/O Driver

1. Run the Command Prompt as an administrator.

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

sc config lltdio start= auto
sc start lltdio

3. Close the command window and restart the computer.

The lltdio service is using the lltdio.sys file that is located in the %WinDir%\system32\DRIVERS folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.