HRESULT 0x8004251B (VDS_E_VOLUME_ON_DISK): meaning and diagnosis

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the disk operation requires an empty disk but one or more volumes occupy it.

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VDS_E_INVALID_PACK	VDS_E_DRIVER_INVALID_PARAM

VDS_E_VOLUME_ON_DISK

VDS_E_VOLUME_ON_DISK means the selected disk contains volume extents that block an operation such as cleaning, conversion or pack manipulation. VDS can enumerate disk extents and distinguish free space from data extents linked to volumes.

Map every occupied extent before changing the disk

Call QueryExtents and identify data extents and their volume objects.
Confirm whether volumes span other disks before planning deletion.
Back up required data and remove volume dependencies through supported volume operations.

Deleting a drive letter does not remove the underlying volume extent. Likewise, formatting a volume still leaves a volume on the disk. If the goal is to make the disk empty, use an explicit destructive workflow and verify the target by unique disk identification data before deleting volumes or cleaning partition information.

QueryExtents · IVdsDisk · Clean

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