How to Conveniently Fix FAT File System Error?

Numerous Windows users have encountered Blue Screen of Death: FAT file system error after upgrading their operating system to the latest version like Windows 10 or after installing a new hardware component. Since it’s a startup error, the user cannot boot the affected computer.

So, in this informative editorial, it is explained how to fix FAT file system error in an easy way along with the probable reasons responsible for the appearance of the error message.

Error Code:

“Your PC ran into a problem and needs restart. We’re just collecting some error info, and then we’ll restart for you.”

“If you’d like to know more, you can search online later for this error FAT FILE SYSTEM (fastfat.SYS)”


Below listed are the main possible reasons for your computer to display a FAT file system error.

  • Outdated/faulty driver software or driver conflict with system files
  • Corrupt file system
  • Damaged/broken system files
  • Virus attack
  • Corrupt hard drive or bad sectors on the disk

Step-by-Step Instructions to Fix FAT File System Error:

Step 1: Remove Externally Connected Devices

Remove all portable devices connected externally to your computer including the external hard drive, keyboard, mouse, etc. Now restart your system and check whether the FAT file system error is resolved or not.

If the error is fixed and your computer boots normally then it is clear that one of your removable devices is damaged/faulty. To find out the culprit, connect one device at a time and see which one gives the FAT file system error. Finally, replace the affected device with a new one.

Step 2: Scan Your Computer for Virus

Most of the times, severe virus attack on a healthy computer makes it unbootable and gives various error messages. Hence, running an antivirus scan to get rid of the virus or any other malicious scripts from the system is recommended to resolve FAT file system error.

Procedure to run a virus scan when the system is not booting:

  • Shut down the computer using the power button
  • Turn it ON and press F8 key before Windows loads
  • Select Safe Mode in the Advanced Boot Options
  • Now, your system enters into Safe Mode; try to run the antivirus scan

Step 3: Update Drivers

Outdated, missing, corrupt or damaged driver software is one of the motives for the FAT file system error on Windows operating system. So, you have to update existing drivers and remove faulty one from the system in order to fix this error code.

Since your system is not booting due to the BSOD FAT file system error, you need to boot your computer in Safe Mode then, update drivers. Here is how to do it.

  • Turn OFF the system using the power button
  • Power it and press F8 key before Windows loads
  • Click Safe Mode or Safe Mode with Command Prompt in the Advanced Boot Options
  • Once the computer boots, open Device Manager from the Start menu if, you have selected “Safe Mode” in the last step
  • Type devmgmt.msc and press Enter key, in case you have opted “Safe Mode with Command Prompt” option
  • In Device Manager, find and select the device for which you need to update driver software, right-click and select Update/Update Driver Software…
  • Next, select Search automatically for updated driver software to update software automatically
  • Else, go for Browse my computer for driver software to update your drivers manually
  • Complete the process

Step 4: Run System File Checker

SFC (System File Checker) scans and repairs corrupt or damaged system files present in your Windows computer. So, running it may fix corrupt file system and Windows files; hence FAT file system error.

To run SFC:

  • Boot your computer into Safe Mode with Command Prompt (as described earlier)
  • In the Command Prompt, type sfc /scannow and hit Enter key.
  • Wait until you see the message “The operation completed successfully” or “Windows Resource Protection did not find any integrity violations” and close Command Prompt.
  • Now, boot your system normally and see FAT file system error is resolved.

Step 5: Run Check Disk

Running CHKDSK tool on your hard drive helps in detecting and repairing the file system errors, drive issues and bad sectors. So, if bad sectors or corrupt hard drive is causing the FAT file system then running CHKDSK can fix it.

Steps to run CHKDSK:

  • Open Command Prompt in Safe Mode.
  • Type chkdsk /f /r and press Enter.
  • Press Y if you are prompted to schedule the scan and reboot the system.

Once the CHKDSK scanning process gets completed, boot your system normally.

Note: It is recommended to recover data from hard drive with bad sectors before you start CHKDSK. Because, running CHKDSK on a hard drive, external hard drive, USB drive, or on any other storage drive having bad sectors may result in data loss. So, connect your drive to another working computer and recover data from it first.

If you are unable to recover data from the drive in this way then, make use of an effective data recovery program like Remo Recover and safely restore your files from the affected hard disk. This program can assuredly recover corrupted FAT32 partition, FAT 16, FAT, NTFS, etc. file system formatted storage devices in an hassle-free way.

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