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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.
This one is different, though. The original issue was that Windows failed to upgrade ReFS volumes under certain conditions (e.g. portable drives), so as new KB's and releases piled up, Windows stopped recognizing the volume and there was no way to get the data back without uninstalling the culprit KB or attaching the drive to an older Windows machine.
What you are describing is the opposite - Windows upgrades ReFS version automatically, causing ReFS volumes to be unreadable on older Windows releases, but you can still access your data on Windows 11.
I suggest moving your backup data to an NTFS volume. Less headache.
What you are describing is the opposite - Windows upgrades ReFS version automatically, causing ReFS volumes to be unreadable on older Windows releases, but you can still access your data on Windows 11.
I suggest moving your backup data to an NTFS volume. Less headache.
Correct on both counts!