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VDS_S_DISK_MOUNT_FAILED
This warning is disk-scoped but the failed actions are volume mounts. A disk can contain multiple volumes, and VDS reports volume objects and mount state separately. The message explicitly allows one or more volumes on the disk to have failed mounting, so the correct diagnostic unit is each volume rather than the physical disk as a single success/failure object.
Why this state matters
Enumerate the volumes and check which ones are mountable, already permanently dismounted, missing file-system support, or failing provider/file-system open. IVdsVolumeMF::Mount is the VDS mount operation. A missing drive letter alone does not prove mount failure because access paths are separate from the mounted state.
Diagnostic focus
- Enumerate every volume associated with the disk and record individual VDS IDs and mount status.
- Attempt to correlate the warning with volume-specific provider or file-system events.
- Distinguish an unmounted volume from a mounted volume that simply has no drive letter.
- Retry mount only for the specific failed volumes after their current state and access-path policy are understood.
Technical references
IVdsVolumeMF::Mount · IVdsVolumeMF · VDS_VOLUME_PROP · VDS_NOTIFICATION · MS-VDS error codes
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