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VDS_E_VOLUME_PERMANENTLY_DISMOUNTED
VDS_E_VOLUME_PERMANENTLY_DISMOUNTED has a precise VDS dismount meaning. The volume is already permanently dismounted, so a request for a temporary dismount cannot proceed until the volume becomes mountable. It is not a generic indication that the file system has been permanently damaged.
Permanent and temporary dismount are different states
IVdsVolumeMF::Dismount accepts a bPermanent flag; a permanent dismount takes the volume offline after dismounting it. VDS volume properties represent an offline volume with both offline status and the permanently-dismounted volume flag. A client should refresh those properties instead of repeatedly issuing the temporary dismount request.
What to verify
- Record the
bPermanentvalue and the exact volume object used for the failing Dismount call. - Query the volume status and flags to confirm that the object is already offline and permanently dismounted.
- Resolve the condition that prevents the volume from becoming mountable, then refresh the VDS object before choosing a new dismount action.
References
- Microsoft: IVdsVolumeMF::Dismount
- Microsoft: VDS_VOLUME_PROP offline flags
- Microsoft Open Specifications: VDS dismount error codes
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