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VDS_E_VD_IS_BEING_DETACHED
This HRESULT corresponds to VDS_VST_DETACH_PENDING. VDS has begun detach, but the operating-system disk object associated with the virtual disk has not yet been removed. Another state-changing operation is rejected because the topology transition is incomplete.
Why this state matters
The published state sequence is precise: after the disk object is removed, the virtual disk returns to OPEN; releasing the opened interface then returns it to ADDED. A caller that immediately tries to attach, expand, or reopen during DETACH_PENDING can race the removal. The correct boundary is completion of the detach lifecycle, not merely return from the code that initiated it.
Diagnostic focus
- Correlate the HRESULT with the active detach request and wait until its device-removal transition has completed.
- Observe the VDS state and disk-device disappearance rather than issuing another detach as a progress test.
- Ensure applications and volume users are not delaying or conflicting with removal of the surfaced disk.
- Once detached, reopen the virtual disk as required by the next operation and refresh its properties before reuse.
Technical references
IVdsOpenVDisk::Detach · VDS_VDISK_STATE · MS-VDS virtual disk state transitions · VDS_VDISK_PROPERTIES · detach vdisk command
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