How to Fix BSOD Error “FAT FILE SYSTEM (fastfat.sys)” on Windows?

Blue Screen of Death (BSOD) error with error detail FAT FILE SYSTEM (fastfat.sys) restarts OS to avoid further damage to the system. FAT File System Error on windows 10 happens due to outdated Windows, outdated device drivers, corrupted system files, corrupted drives, conflicting folder protecting / encryption applications, false positive by Anti-virus and corrupted Windows. Perform the below solution to resolve this error.

Solution 1: Diagnose Hardware (HP Startup Manager)

1. Switch off the computer.
2. Power on the computer and press the Esc button immediately in order to open the HP Startup Menu.
3. Press the F2 button when HP Startup Menu appears.
4. Go to Components Tests > Hard Drive > Hard Disk test.
5. Go to Components Tests > Memory > Memory test.
6. If any error reported during the test, repair or replace it accordingly.

Solution 2: Execute System File Checker Command

1. Boot into Safe Mode with Command Prompt.
2. Type sfc /scannow and press Enter.
3. Wait until the message The operation completed successfully or Windows Resource Protection did not find any integrity violations show then close Command Prompt.
4. Reboot system normally.

Solution 3: Execute ChkDsk Command

1. Boot your system into Safe Mode or Advanced Repair Options to go into the command prompt.
2. In the Windows Setup screen, go to Next > Repair your computer > Troubleshoot > Advanced options > Command Prompt.
3. In the command prompt, type: chkdsk /f /r and press Enter.

Solution 4: Execute Driver Verifier Manager

1. Run Command Prompt as Administrator.
2. In the command prompt, type: verifier and press Enter.
3. In the Driver Verifier Manager dialog box, select Create standard settings and press Next.
4. Select Automatically select all drivers installed on this computer and press Next.
5. Windows will start to scan for errors.
6. Restart the computer.
7. It will start to analyze all the drivers installed on the computer for issues. If any broken drivers are found, then update it.

Solution 5: Uninstall Folder Protection / Encryption Applications