What is sthda?

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

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

Sthda.sys file information

The process known as NDRC belongs to software SigmaTel High Definition Audio CODEC or C-Major Audio by SigmaTel ( or IDT (

Description: Sthda.sys is not essential for the Windows OS and causes relatively few problems. Sthda.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 1,222,840 bytes (31% of all occurrences), 1,156,648 bytes and 9 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. There is no detailed description of this service. Sthda.sys is not a Windows core file. Sthda.sys is a Microsoft signed file. There is no information about the author of the file. Therefore the technical security rating is 24% dangerous, however you should also read the user reviews.

Recommended: Identify sthda.sys related errors

Important: Some malware disguises itself as sthda.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the sthda.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.


User Comments

Driver name for SigmaTel High Definition Audeo CODEC. Check out Intel Audeo Studio
download driver sthd.sys
It's the process for the c-major audio or sigmatel audio YOU NEED THIS FOR ANY AUDIO AT ALL
sigma tel hight definition audio

Rating chart

Summary: Average user rating of sthda.sys: based on 8 votes with 4 user comments. 7 users think sthda.sys is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous. One user is not sure about it.

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Best practices for resolving sthda issues

A clean and tidy computer is the key requirement for avoiding problems with sthda. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the sthda.sys process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

sthda.sys [all]