Windows BSOD Error 0x00000023 — FAT_FILE_SYSTEM Fix

What it means

The 0x00000023 blue screen means Windows found a serious problem with a FAT-formatted drive.
FAT is an older file system used on USB drives, SD cards, and older hard drives.
This crash usually means the drive is corrupted or failing.

Affected Models

Windows 10
Windows 11
Windows 8.1
Windows 7

Common Causes

A USB drive or SD card was removed while Windows was still writing to it
The FAT file system on an external drive is corrupted
An aging hard drive or flash drive has failing sectors
A third-party disk utility has damaged the file system structure
Windows was shut down improperly while a FAT drive was connected

How to Fix It

Unplug all external USB drives and SD cards, then restart your PC.

If the blue screen stops, one of those devices is the culprit.
Plug them back in one at a time to find it.
Run Check Disk on the suspected drive. Open Command Prompt as Administrator and type: chkdsk X: /f /r (replace X with the drive letter).

This scan finds and repairs file system errors and bad sectors.
It may take 30–60 minutes on a large drive.
Check if the drive is failing. In Command Prompt type: wmic diskdrive get status. A healthy drive shows 'OK'.

If the status shows 'Pred Fail' or any error, back up your data immediately — the drive is dying.
Update your storage controller drivers. Open Device Manager, expand 'Disk drives', right-click your drive, and choose 'Update driver'.

Outdated storage drivers can misread FAT drives and cause this crash.
If the problem drive is a USB stick or SD card, back up your files and reformat it as FAT32 or exFAT.

Reformatting erases all data but gives the drive a clean file system.
Only do this after you have backed up your files.

When to Call a Professional

If the error happens on your main internal hard drive, take your PC to a repair shop.
A technician can run deep disk diagnostics and recover data before it is lost.
Do not delay — a failing drive can become unreadable quickly.

Frequently Asked Questions

What is a FAT file system?

FAT stands for File Allocation Table.
It is an older way of organizing files on a drive.
USB sticks, SD cards, and older external drives often use FAT or FAT32.
Your main Windows drive uses NTFS, which is more modern and reliable.

Will I lose my files if I run chkdsk?

Running chkdsk /f /r should not delete your files.
It repairs the file system structure.
However, on a badly damaged drive, some files may already be unreadable.
Always back up important files before running disk repair tools.

Can this error happen without a USB drive plugged in?

Yes, it can happen if your main hard drive has a FAT-formatted partition.
This is rare on modern PCs but can happen on older systems or dual-boot setups.
Run chkdsk on all drives to find the problem.