Fix: FAT file system error ‘fastfat.sys’ Windows 11 2022

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Check Fix: Windows 11 FAT File System “fastfat.sys” Error

For Windows users, the blue screen of death (BSOD) is a common annoyance. Many Windows users have seen the “FAT FILE SYSTEM (fastfat.sys)” blue screen of death, which can occur several times after the first crash. Outdated drivers, faulty hardware, corrupted drivers and general system corruption issues are the most common causes of this problem. In this article, we will guide you through step-by-step troubleshooting strategies to resolve this issue.

Steps before trying the solutions

Before troubleshooting the system,

  • Make sure you have administrator access to the system.
  • If your system is part of a network or domain, the policies of the network or domain may prevent you from performing different operations on the system, so remove the system from the network or domain and try the solutions and after solved the problem, reconnect the PC to the network/domain.
  • Make sure to start your system in safe mode. And if you can’t boot your system in safe mode, use Windows installation media.
  • Don’t forget to “back up” your essential data, as long as you can log into the system.
  • Be sure to take a detailed look at common BSOD fixes. Remember that you don’t need to try all the solutions, just find out the possible reason behind this error and act accordingly.

Hardware problem or software problem

BSOD is a Windows self-protection feature in which the computer shuts down abruptly to protect against data loss or corruption. Any BSOD error can be caused by the failure of a hardware device, its driver or associated software. Before proceeding with troubleshooting, it is essential to make sure that the problem is related to hardware or software. One of the major causes of this error is file system corruption, bad blocks or bad sectors on the system disk. Another possible cause is non-paged pool memory exhaustion. To rule out, if the error is hardware related, we need to check if the hard drive and memory are working properly. Manufacturers have included memory and hard drive tests in their BIOS or settings. And by using these tests, we can identify whether our problem is software or hardware related. For demonstration purposes, we will use the HP boot menu (you should follow your system manufacturer’s guidelines).

  • Turn off the system.
  • Then turn on the system and immediately start pressing the Esc button to open the HP boot menu
  • When the HP boot menu appears, press F2
  • From the main menu, click Component Tests.
  • Under Component Tests, select Hard Drive to run the hard drive test.
  • And after completing the hard drive test, repeat steps 1-4.
  • Now under Component Test select Memory to run the memory test.

If any errors were reported after the hard drive test and memory tests, the FAT file system error in Windows 10 is hardware related and you should have your PC checked at a genuine repair shop. And if no bugs were reported after testing, it is a software-related issue.

Remove faulty hardware from the system

The FAT file system error in Windows 10 can be caused by faulty hardware or its driver and removing all devices (which might be removed) and reconnecting them one after another to identify the problematic hardware ( if applicable).

  • Turn off the system.
  • Clear all USB ports, SD card slots and remove the external hard drive.
  • Remove the mouse and keyboard and reconnect them if necessary to communicate with the PC.
  • Leave only one RAM in the system and delete all the others, if there are several.
  • If there is more than one storage drive, SSD or HDD in the system, remove all of them (just unplug their power cables) except the one with an operating system on it.
  • Remove the graphics card except the integrated one.
  • Now restart the computer to check if you still have the FAT file system error in Windows 10 error and if the system is clean then shut it down.
  • Add any of the removed devices and turn on the system, check if the error appears. Repeat these steps until you find the faulty device.
  • Once the faulty device is identified, try the faulty device on another computer to see if the device is damaged. If so, please replace the defective one with a new one.

Run the ChkDsk command

A hard drive with long usage starts accumulating damage and errors caused by factors like unexpected system shutdowns, corrupted software, bad sectors and metadata corruption. This factor alone can cause many system errors including FAT file system error in Windows 10. Microsoft has included a CHKDSK utility in Windows to check and repair hard drive for corruption or damage. So running CHKDSK may fix the problem.

  • If you can boot your system in safe mode, proceed to step 10.
  • If you cannot boot into safe mode, try using advanced repair options and accessing the command prompt (continue from step 10).
  • If you cannot boot into safe mode and cannot use advanced repair options, create Windows installation media.
  • Connect Windows installation media, boot your system and boot from Windows installation media (remember to change BIOS to boot from Windows installation media).
  • On the Windows Setup screen, click Next.
  • Click the Repair your computer link on the next screen of the same window.
  • Now click Troubleshoot on the next screen.
  • Then press Advanced Options in the Troubleshoot window:
  • Now under Advanced Recovery Options click on Command Prompt
  • At the command prompt, type

chkdsk /f /r

  • And press Enter.
  • Then, if prompted, press Y on your keyboard to allow this volume to be checked the next time you restart your computer.
  • Remember that you can also run CHKDSK by connecting the problematic system’s hard drive to another working PC.
  • After running ChkDsk by any method, restart your system in normal mode and check if your system is free from FAT file system errors in Windows 10.

Run Driver Verifier to identify the problematic driver

Device drivers communicate between the operating system and hardware. If any of these drivers are misconfigured, corrupted or outdated, you will encounter many errors including the FAT file system error in Windows 10. Windows has a built-in driver checker utility to check if the one of the drivers is not working properly and if there are any errors. some mistakes. detected by Driver Verifier, we can fix it by updating it to the latest version.

  • Press the Windows button and type “command prompt”, and in the displayed list, right-click “Command Prompt” and click Run as administrator.
  • Now, in the elevated command prompt, type the following command:


  • And press Enter.
  • Now in the Driver Verifier Manager, select “Create a standard configuration” and press “Next” to continue.
  • Select the “Automatically select all drivers installed on this computer” option, then click “Finish”.
  • Now Windows will check for errors. Once prompted to restart your computer, do so.
  • When Windows restarts the next time, it will scan all drivers installed on your computer for problems. If it detects any issues, it will notify you accordingly. This may take some time, so be patient and let the process complete.
  • If corrupted drivers are detected, update them.
  • After updating the drivers, see if you can boot the system without the FAT file system error in Windows 10 error.

Uninstall folder protection/encryption apps

Some folder encryption and protection programs may show FAT_FILE_SYSTEM. These applications can cause a BSOD error because their encryption method interferes with your hard drive. If you are using any of these tools, uninstalling them may solve the problem.

  • Start your system in safe mode.
  • Press the Windows button and type “control panel” and in the list that appears, click on the “control panel”.
  • In the Control Panel, click “Uninstall a program”.
  • In the Program and Features window, find and right-click on the protection/encryption software, then click “Uninstall”.
  • Follow the onscreen instructions to complete the uninstallation.
  • After uninstalling the protection/encryption software, boot the system in normal mode and check if the system is free from FAT file system errors in Windows 10.

Final Words: Fix: FAT FILE SYSTEM ‘fastfat.sys’ Error Windows 11

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