What is tfsncofs?

Tfsncofs.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 tfsncofs.sys is a Windows system file or if it belongs to an application that you can trust.

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

Tfsncofs.sys file information

The process known as Drive Letter Access Component belongs to software Sonic DLA or IBM DLA by Sonic Solutions (

Description: Tfsncofs.sys is not essential for the Windows OS and causes relatively few problems. Tfsncofs.sys is located in a subfolder of C:\Windows\System32. Known file sizes on Windows 10/8/7/XP are 34,843 bytes (63% of all occurrences), 34,837 bytes or 34,845 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. There is no file information. The program is not visible. The service has no detailed description. The tfsncofs.sys file is not a Windows core file. The process can be removed using the Control Panel's Add\Remove programs applet. tfsncofs.sys appears to be a compressed file. Therefore the technical security rating is 31% dangerous.

Uninstalling this variant: It is possible to do the following:

Recommended: Identify tfsncofs.sys related errors

Important: Some malware camouflages itself as tfsncofs.sys. Therefore, you should check the tfsncofs.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 tfsncofs issues

A clean and tidy computer is the key requirement for avoiding problems with tfsncofs. 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 tfsncofs.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

tfsncofs.sys [all]