What is HDAudBus?

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

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HDAudBus.sys file information

The process known as High Definition Audio Bus Driver (version v1.0a, v1.0) belongs to software Microsoft UAA Bus Driver for High Definition Audio or Microsoft Windows Operating System by Windows® Server ( (version 2003 DDK provider) or Microsoft (

Description: HDAudBus.sys is not essential for the Windows OS and causes relatively few problems. HDAudBus.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 144,384 bytes (62% of all occurrences), 138,752 bytes and 5 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The service has no detailed description. The file is not a Windows core file. The file is a Microsoft signed file. HDAudBus.sys appears to be a compressed file. Therefore the technical security rating is 18% dangerous, however you should also read the user reviews.

Recommended: Identify HDAudBus.sys related errors

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

Microsoft Universal Audio Architecture (UAA) High Definition Audio class driver
  L. Flowers   (further information)
Universal Audio Architecture (UAA) High Definition Audio class driver
  Heinz Fink   (further information)
high defination audio system file
pci divice
i need this file so i can listen music in my computer, where can i found it
yes it a driver no doubt had to reinstall it for asus soundmax it was deleted due to a chrash of I former windows partition
e bom para o windows
Necessary driver for the High Definition Audio bus. Without it, programs such as 'SoundMAX' will not load.
  Mikey VN  
sound won't work with out it
  Ross Page  
This driver is on the High Definition Audio Bus and is essential to the Front Panel Audio operatation. If the front panel audio is improperly configured (ie. the wrong dongled pins are coneccted to the motherboard or the incorrect pci video device driver is installed then the hdaudbus.sys driver will cause problems when an audio jack is plugged into the front or rear jack). Setting bios to AC97 prevents BSOD when plugging into front jack but does not eliminate error when plugging into rear HD Jack. BSOD suggests disabling video adapter since driver is installed when video driver is install
This message is harmless- hd (high definition) aud (audio) bus (silver track on MB leads to 7.1-5.1 audio back panel). MoBo P5N-D at XP32pro startup, found new hardware "microsoft UAA cabinet file is needed" linked to Win OS. It's just asking for drivers for High Definition operation. Do you need HD operating? Plug in your SPDIF/ FibOpt or go to [ ] to request hot fix driver to be emailed to you to solve the UAA/hdaudbus issue either from popping up at startup or no audio sound.
  vzg   (further information)
Required for sound
after reinstallation again the hdaudbus.sys file missing, & unable to listen music.

Rating chart

Summary: Average user rating of HDAudBus.sys: based on 33 votes with 13 user comments. 21 users think HDAudBus.sys is essential for Windows or an installed application. 6 users think it's probably harmless. 5 users think it's neither essential nor dangerous. One user suspects danger. One user is not sure about it.

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Best practices for resolving HDAudBus issues

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

HDAudBus.sys [all]