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VDS_S_DISMOUNT_FAILED
IVdsVolume::SetFlags documents that setting HIDDEN or READONLY normally forces a dismount and remount unless revert-on-close is used. This warning therefore reports a partial transition: the flag operation reached the point where VDS attempted to dismount the volume, but that dismount failed. It should not be simplified to “SetFlags failed completely.”
Why this state matters
A dismount can fail when the volume is in use unless force semantics apply in the relevant operation. The important task is to requery the resulting flags and mount state because the warning describes failure after flag processing began. Issuing another flag change without knowing the current state can compound the partial transition.
Diagnostic focus
- Requery volume flags and mount/offline state immediately after receiving the warning.
- Identify which requested flags require the dismount/remount cycle and preserve the original mask.
- Check open handles and volume-use conditions if the dismount boundary is failing.
- Do not assume the old flags remain intact; verify the actual VDS volume properties before retrying.
Technical references
IVdsVolume::SetFlags · IVdsVolumeMF::Dismount · IVdsVolumeMF::Mount · VDS_VOLUME_FLAG · MS-VDS error codes
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