What does HRESULT 0x80042919 (VDS_E_VDISK_NOT_OPEN) mean?

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The VDS virtual disk object has not been opened for handle-based operations.

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VDS_E_COMPRESSION_NOT_SUPPORTED	VDS_E_VDISK_INVALID_OP_STATE

VDS_E_VDISK_NOT_OPEN

This HRESULT belongs to the VDS virtual-disk object lifecycle. An IVdsVDisk object can exist in the service object list before its backing virtual-disk file has been opened. IVdsVDisk::Open creates the opened-handle representation and returns IVdsOpenVDisk, which exposes attach, detach, compact, merge, and expand operations.

Why this state matters

The important distinction is between discovering a VDS object and opening the virtual disk for an operation. VDS_VDISK_PROPERTIES.State reports the lifecycle state. In the published VDS model, an added object transitions to VDS_VST_OPEN only after Open succeeds. Re-enumerating the object does not substitute for that open step.

Diagnostic focus

Log the virtual disk object ID, backing path, and current VDS_VDISK_STATE before the failing call.
Confirm that IVdsVDisk::Open completed successfully and that the returned IVdsOpenVDisk pointer is still held by the caller.
Check the requested access mask and open flags; a failed open must not be hidden by continuing with later operations.
Do not retry attach, merge, or expand on a newly enumerated IVdsVDisk object until the open lifecycle has been completed again.

Technical references

IVdsVDisk · IVdsVDisk::Open · IVdsOpenVDisk · VDS_VDISK_STATE · MS-VDS virtual disk state transitions

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