What is vmstorfl?

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

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

Vmstorfl.sys file information

The process known as Virtual Storage Filter Driver or Disk Virtual Machine Bus Acceleration Filter Driver belongs to software Disk Virtual Machine Bus Acceleration Filter Driver or Microsoft Windows Operating System by Microsoft ( or Microsoft Windows.

Description: Vmstorfl.sys is not essential for the Windows OS and causes relatively few problems. The vmstorfl.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 40,896 bytes (50% of all occurrences) or 40,704 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The vmstorfl.sys file is certified by a trustworthy company. There is no detailed description of this service. Vmstorfl.sys is not a Windows core file. Vmstorfl.sys is a Microsoft signed file. vmstorfl.sys appears to be a compressed file. Therefore the technical security rating is 11% dangerous, however you should also read the user reviews.

Uninstalling this variant: The software publisher Microsoft provides an uninstall program (Control Panel->Software->Microsoft Windows).

Recommended: Identify vmstorfl.sys related errors

Important: Some malware disguises itself as vmstorfl.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the vmstorfl.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 Virtual Machine Disk/Bus Acceleration Filter driver
  SB   (further information)

Summary: Average user rating of vmstorfl.sys: based on 1 vote with 1 user comment. One user thinks vmstorfl.sys is essential for Windows or an installed application.

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Best practices for resolving vmstorfl issues

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

vmstorfl.sys [all]