What is cmuda?

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

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

Cmuda.sys file information

The process known as C-Media Audio WDM Driver belongs to software C-Media WDM Audio Interface by C-Media (

Description: Cmuda.sys is not essential for the Windows OS and causes relatively few problems. The file cmuda.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 1,373,120 bytes (55% of all occurrences), 1,332,544 bytes, 805,440 bytes or 812,416 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. There is no detailed description of this service. The file is not a Windows system file. Cmuda.sys is a Microsoft signed file. cmuda.sys appears to be a compressed file. Therefore the technical security rating is 22% dangerous, however you should also read the user reviews.

Recommended: Identify cmuda.sys related errors

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

C-Media Audio WDM Driver
c-media ac97 audio device
well it makes my PC reboot after logging on. If I disable it then the sound goes for a 6 :-((
  Hungry Wolf  
audio driver
latest version
It is used by c-media, but it often gives people, including myself, the blue screen... so, my advice is buy a cheap sound card and replace c-media and their crap.
c_media Wave driver
My WoW crashes cause of that file....i get the blue screen after the crash....
causes my computer to switch off when logged on and when disabled sound goes.
Is a audio driver for Media Audio Controller
  Eugen Cernat  
old version crashes certain applications when trying to initialize directsound. latest version seems to fix it.
  chris ogloff  
C-Media Audio WDM Driver (Included with WinXP)
Updating this driver (?) solved a serious problem with my computers sound system.
CMedia AC97 Audio Device driver
  dsrone969   (further information)
It don't allow the sound to work after running a retail O/S. The C-Media AC 97 audio driver don't work .I'm try to find It now.The driver don't work.
I often have blue screen with it
My MSTS crashes cause that file.........I get the blue screen..

Rating chart

Summary: Average user rating of cmuda.sys: based on 38 votes with 17 user comments. 27 users think cmuda.sys is essential for Windows or an installed application. 10 users think it's probably harmless. One user suspects danger. 4 users don't grade cmuda.sys ("not sure about it").

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Best practices for resolving cmuda issues

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

cmuda.sys [all]