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VDS_E_PROVIDER_VOL_OPEN
This HRESULT marks the next boundary after volume-device-name resolution: the provider could not open the device representing the volume. The VDS object can still be known to the service, so this is not equivalent to a missing object or a missing access path. Open failure can reflect device lifetime, current mount/offline state, sharing or lower-layer provider conditions; the status itself does not name one of those causes.
Why this state matters
Diagnostics should preserve the provider and volume identity and then inspect events from the same time window. A VDS Refresh updates cached object views, but Microsoft warns against calling it from OnNotify because doing so can cause notification loops. If the volume was just arriving or departing, let the notification sequence settle before retrying the provider operation.
Diagnostic focus
- Record the exact VDS volume ID and provider rather than reporting only a drive letter.
- Correlate volume arrival/departure notifications with the failed open attempt.
- Check whether the volume is temporarily/permanently dismounted or otherwise transitioning before retrying.
- Perform any cache refresh outside the notification callback and re-resolve the object before another provider call.
Technical references
VDS_VOLUME_NOTIFICATION · IVdsAdviseSink::OnNotify · IVdsService::Refresh · IVdsVolumeMF::Dismount · VDS common return codes
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