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ERROR_FS_DRIVER_REQUIRED
Windows reached a volume whose file-system implementation was not available
Windows file systems are implemented by file-system drivers above the storage stack. Reaching the disk or volume device is therefore not enough to interpret directories and files: the correct file-system driver must recognize and mount the volume. This status indicates that the I/O path needs such a driver and it has not yet been loaded.
Distinguish this from a generic device I/O failure. The storage device may be online and readable while the layer that understands the on-disk format is absent. Check the volume format, the expected file-system service, and load or startup failures for that driver. For custom or filter-based stacks, remember that a minifilter is not the file-system implementation itself; loading an unrelated filter does not make an unsupported format mountable. Event logs and driver load diagnostics are more useful than repeatedly opening the same path.
What to inspect
- Identify the volume and expected file-system format.
- Check whether the matching file-system driver service loaded successfully.
- Review System and Code Integrity logs if the driver image was rejected.
References
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