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

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Fix: FAT FILE SYSTEM ‘fastfat.sys’ Error Windows 11 – Guide

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 Outdated drivers, faulty hardware, corrupt drivers and general system corruption issues are the most common causes of this issue.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

Steps before trying solutions

Before proceeding with system troubleshooting,

Make sure you have administrator access to the system.

If your system is part of a network or domain, then network or domain policies may prevent you from performing different operations on the system, so remove your system from the network or domain and try the solutions and after resolving the issue, rejoin the PC to the network/domain.

Make sure to boot your system in safe mode. And if you are unable to boot your system in safe mode then use Windows installation media.

Do not forget to “back up” Essential Data whenever you can log into the system.

Be sure to take a detailed look at common BSOD fixes. Remember that you don’t have to try every solution, just find out the possible reason that is causing this error and take the necessary measures.

Hardware problem or software problem

BSOD is a Windows self-protection feature where the computer abruptly shuts down to protect itself from data loss or damage. Any BSOD error can be caused by the failure of a hardware device, its driver or related software. Before proceeding with troubleshooting, it is essential to check whether the problem is hardware or software related. One of the main causes of this error is file system corruption, bad blocks or bad sectors on the system disk. Another possible cause is running out of nonpaged pool memory. To factor in, if the error is hardware related, we should check that the HDD and memory are working properly. Manufacturers have included HDD and memory tests in their BIOS or configuration. And using these tests we can identify whether our problem is software or hardware related. For demonstration purposes, we will use the HP Startup Menu (you should follow your system manufacturer’s guidelines).

Shut down the system.

Then turn on the system and immediately start pressing Esc button to open the HP boot menu

When the HP boot menu appears, press the F2 key

From the main menu, click Component Tests.

In Component Tests, select Hard Disk to run the Hard Disk test.

And after the hard disk test is completed, repeat steps 1 to 4.

Now in Components Test, select Memory to run the Memory test.

If any errors were reported after testing the hard drive and memory tests, then the Windows 10 FAT file system error is hardware related and you should have your PC checked by an authentic repair shop. And if no errors were reported after testing then it is a software related issue.

Remove faulty hardware from the system

FAT file system error in Windows 10 can be caused by faulty hardware or its driver and removing all peripherals (which can be removed) and reconnecting one after the other to identify the problematic hardware (if any).

Shut down the system.

Clean all USB ports, SD card slots and remove external HDD.

Remove the mouse and keyboard and reconnect them as needed to communicate with the PC.

Leave only one RAM in the system and remove all others if there is more than one.

If there are more than one storage drive SSDs or HDDs in the system, remove all of them (simply unplug the power cords) except the one that has the OS.

Remove the graphics card other than the integrated one.

Now restart your computer to check if it still has FAT File System Error in Windows 10 and if the system is clean then shut down the system.

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, test the faulty device on another computer to see if the device is damaged. If yes, replace the defective one with a new one.

Run ChkDsk command

A hard drive with prolonged use starts accumulating damage and errors caused by factors like unexpected system shutdowns, corrupted software, bad sectors and metadata corruption. This factor alone can cause various system errors including FAT File System Error in Windows 10. Microsoft has included a CHKDSK utility in Windows to scan and repair HDD for any corruption or damage. So running CHKDSK might solve the problem.

If you can boot your system in safe mode, go to step 10.

If you are unable to boot into safe mode, try using advanced repair options and go to the command prompt (proceed from step 10).

If you cannot boot into safe mode and cannot use advanced repair options, create Windows installation media.

Connect the Windows installation media, boot your system and boot from the Windows installation media (don’t forget to change the BIOS to boot from the Windows installation media).

On the Windows installation screen, click Next.

Click the Repair your computer link on the next screen of the same window.

Now click on Troubleshoot on the next screen.

Then press Advanced Options in the Troubleshooting 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 the keyboard to allow that volume to be checked the next time the computer restarts.

Remember that you can also run CHKDSK by connecting the problematic system’s HDD to another working PC.

After running ChkDsk by any method, restart the system in normal mode and check if the system is free from FAT file system error 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 various errors including FAT File System Error in Windows 10. Windows has a built-in Driver Verifier utility to check if any of the drivers are not working properly and for errors. 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 list that appears, right-click “Command Prompt” and click Run as administrator.

Now, in the elevated command prompt, type the following command:

checker

And press Enter.

Now in Driver Verifier Manager, select “Create standard settings” and press “Next” to proceed.

Select the “Automatically select all drivers installed on this computer” option and click “Finish”.

Now Windows will look for errors. After you are prompted to restart your computer, do so.

When Windows restarts the next time, it will scan all the drivers installed on your computer for problems. If it finds any problems, it will notify you accordingly. This can take time, so be patient and let the process finish.

If any broken drivers are found, please update them.

After updating the drivers, see if you can boot the system without FAT file system error on Windows 10 error.

Uninstall Folder Protection/Encryption Apps

Certain folder protection and encryption software can cause FAT_FILE_SYSTEM to appear. These apps can cause BSOD errors as their encryption method interferes with your hard drive. If you are using any of these tools, uninstalling them may resolve the issue.

Boot your system in safe mode.

press the windows button and type “control panel” and in the displayed list, click “control panel”.

In the Control Panel, click on “Uninstall a Program“.

In Program and Features window, locate and right-click the Protection/Encryption software and click “Uninstall”.

Follow the on-screen instructions to complete the uninstall.

After uninstalling the protection/encryption software, boot the system in normal mode and check if the system is free from FAT file system error in Windows 10.

Final note

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