What is mdmxsdk?

The genuine mdmxsdk.sys file is a software component of Diagnostic Interface by Conexant.
A device driver for Conexant Diagnostic Interface, this file interfaces with the audio controller and Windows. It determines if there are any performance issues and relays it through a user interface. Conexant Semiconductors is located in Irvine, CA, and became a private company in 2013.

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

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

Mdmxsdk.sys file information

The process known as Diagnostic Interface DRIVER or Diagnostic Interface (version x86 Driver) belongs to software Diagnostic Interface (version x86 Driver) by Conexant (

Description: Mdmxsdk.sys is not essential for the Windows OS and causes relatively few problems. Mdmxsdk.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 11,043 bytes (30% of all occurrences), 13,059 bytes and 5 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. The service has no detailed description. It is not a Windows system file. Mdmxsdk.sys is a Microsoft signed file. mdmxsdk.sys appears to be a compressed file. Therefore the technical security rating is 20% dangerous; but you should also compare this rating with the user reviews.

Recommended: Identify mdmxsdk.sys related errors

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

it should be a kernel driver
  claudio gabbani  
It's one of the driver files for my laptop's modem
"mdmxdsk" ; File is Copyright by; C o n e x a n t S y s t e m s , I n c . 2 0 0 0; It is a Diagnostic Interface; part of "Creative Modem Blaster V.92 PCI DI5631" Driver SETUP Files; May have extensions SYS, DLL or PDB; Is usually found in Dir X:/i386
  Dandy Dan  
V.92 Modem component
Get an error message saying that file is missing
appeared during Fax\Modem installation
  John Clark  
It is essential for your .dll's to work. Without it your machine will find all your hardware as new everytime you boot up.
Vista reports "Code integrity determined that the image has of a file is not valid. The file could be corrupt due to unauthorized modification or the invalid hash could indicate a potential disk device error."
I think it showed up after SP2 download I've hadsome other driver problems, but it seems to be something I did.
After installing a us robotics modem the hardware wizard says it needs the file. Seemingly its not on the disk or on the downloaded file. Attempting to install it from the downloaded file and/or the disk the computer restarts itself . When it starts it says there has been an extreme error and wants to report to WINDOWS.
i think its part of tunersource.exe and its located in C:\WINDOWS\ServicePackFiles\i386
  sniper of all pirates  
i removed this from my pc a long time ago, cause Its part of the driver/service pack for the HD modem speaker service( a startup service that always runs and uses up resources. I am not sure who uses dailup modems anymore but I can guarantee it was save for me to delete Ill never need it
  J dog  

Rating chart

Summary: Average user rating of mdmxsdk.sys: based on 18 votes with 12 user comments. 6 users think mdmxsdk.sys is essential for Windows or an installed application. 5 users think it's probably harmless. 7 users think it's neither essential nor dangerous. 5 users don't grade mdmxsdk.sys ("not sure about it").

Do you have additional information?

Best practices for resolving mdmxsdk issues

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

mdmxsdk.sys [all]