What is sunkfilt39?

The genuine sunkfilt39.sys file is a software component of Alcor Micro Multimedia Card Reader Controller by Alcor Micro.
Sunkfilt39.sys is a filter driver for Alcor Micro Digital Media Reader chipsets. A filter driver is a software program that adds functionality to peripheral devices. It can even add support for a specialized device in the computer. This file is not a critical Windows component and should be removed if known to cause problems. Alcor Micro Multimedia Card Reader Controller supports USB and PCI Express interfaces. The controller is built for the Windows platform and features an integrated Alcor DMA (direct media access) engine for an enhanced performance. The controller supports SD, CF, MMC, MS and MS Pro card formats. Alcor Micro is a Taiwanese company that designs fabless Integrated Chips (ICs) and provides technology solutions. In 1999, Alcor Micro was one of the first companies to unveil an extremely low cost USB hub controller to the PC market, which was integrated into the world's first ‘USB only' PC (the iMac). Alcor's main focus is on IO (input-output) technology. The company was founded in 1996 and is currently headquartered in Taipei City, Taiwan.

SunkFilt39 stands for Sunkist Filter Driver (version 3.9)

Sunkfilt39.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 sunkfilt39.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for sunkfilt39 drivers in need of updating

Sunkfilt39.sys file information

The process known as SunkFilt39 belongs to software Digital Media Reader by Alcor Micro (

Description: Sunkfilt39.sys is not essential for the Windows OS and causes relatively few problems. The file sunkfilt39.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 42,968 bytes (71% of all occurrences) or 42,936 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. You can uninstall this program in the Control Panel. The service has no detailed description. Sunkfilt39.sys is not a Windows core file. sunkfilt39.sys appears to be a compressed file. Therefore the technical security rating is 24% dangerous.

Uninstalling this variant: If you still experience problems with sunkfilt39.sys, you can also safely remove the program using the uninstall program of Digital Media Reader (Control Panel ⇒ Uninstall a Program).

Recommended: Identify sunkfilt39.sys related errors

Important: Some malware disguises itself as sunkfilt39.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the sunkfilt39.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 sunkfilt39 issues

A clean and tidy computer is the key requirement for avoiding problems with sunkfilt39. 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 sunkfilt39.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

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