Forum Discussion
Solved
ReFS volume appears RAW (version doesn't match expected value) after Windows Update
After Windows Update last night, Windows Server 2019 wouldn't mount a storage space volume as ReFS (it appears as RAW). The error in the ReFS event log is "ReFS failed to mount the volume. Version 1....
I solved this by uninstalling KB5009557. The ReFS volume came back working as it should, instead of appearing as RAW.
Update: since even the February 2022 Windows Update bricks ReFS in the same way, and hints from Microsoft are that ReFS 1.x is no longer supported, we copied everything to new disks, upgrading ReFS from 1.2 to 3.4 in the process. Such a (manual) ReFS upgrade should be the solution that everyone needs, allowing to re-enable Windows Update.
Microsoft just released a series of out-of-band updates (KB5010790 for Windows Server 2016, KB5010793 for Windows 10, KB5010795 for Windows 11, KB5010796 for Windows Server 2022, KB5010794 for older systems, etc.) to address the ReFS issue. For some reason they still claim the bug to be limited to removable media, even if that was not the case for me and others.
Alas, I could not find an out-of-band update for Windows Server 2019. So far, no KB page and no Windows Update showing up. ReFS is still broken by re-applying the current (January 18) KB5009557.
- Thanks for the follow-up much appreciated!
