What does BSOD 0x12C (EXFAT_FILE_SYSTEM) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The exFAT file-system driver detected a fatal on-disk or in-memory consistency problem.

Could be also:
Constant	Type	OS
ERROR_OPLOCK_NOT_GRANTED	Win32 error	Windows
STATUS_VALID_IMAGE_HASH	NTSTATUS	Windows
HTTP_STATUS_AMBIGUOUS	HTTP Code	Any

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FAULTY_HARDWARE_CORRUPTED_PAGE	VOLSNAP_OVERLAPPED_TABLE_ACCESS

EXFAT_FILE_SYSTEM

exFAT file-system failure for EXFAT_FILE_SYSTEM

EXFAT_FILE_SYSTEM is bug check code 0x0000012C.

This bug check belongs to the exFAT file-system driver. It usually means that the driver hit a corrupt metadata structure, invalid cached state, bad removable-media behavior, or a file-system filter interaction that could not be recovered.

How to read it in a dump

The stack should show exfat.sys and any file-system filters above or below it.
The volume type, removable media, dirty bit, metadata repair history, and filter drivers are important.
Do not diagnose it as NTFS corruption; exFAT has its own metadata layout and recovery behavior.

What to check

Run offline file-system checks on the affected volume and preserve the media image if data recovery matters.
Check USB/removable-media errors, unsafe removal, storage drivers, and antivirus/encryption filters.
Compare with disk and controller event logs near the crash.

References

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