What is lltdio?

Lltdio.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if lltdio.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for lltdio drivers in need of updating

Lltdio.sys file information

The process known as Link-Layer Topology Mapper I/O Driver belongs to software Link-Layer Topology Discovery Mapper I/O Driver by Microsoft (

Description: The original lltdio.sys is an important part of Windows and rarely causes problems. Lltdio.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 47,104 bytes (80% of all occurrences) or 48,640 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. It is a Windows core system file. The file is a Microsoft signed file. The program has no visible window. There is no detailed description of this service. lltdio.sys appears to be a compressed file. Therefore the technical security rating is 0% dangerous.

Recommended: Identify lltdio.sys related errors

Important: Some malware disguises itself as lltdio.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the lltdio.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


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Best practices for resolving lltdio issues

A clean and tidy computer is the key requirement for avoiding problems with lltdio. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the lltdio.sys process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

lltdio.sys [all]