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VDS_E_OPERATION_PENDING
VDS_E_OPERATION_PENDING means that VDS reports that the operation is still in progress. It is a state result, not a final success or failure; the caller must wait for completion and obtain the final status before assuming that the disk or volume changed.
What to check
- Keep the asynchronous operation handle or completion context and wait for its terminal status.
- Do not issue dependent operations, such as formatting after creation or extension after conversion, until the pending action completes.
- Use a timeout appropriate for the storage operation and record whether a later cancellation request was accepted or arrived too late.
Microsoft: VDS common return codes
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