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E_SKYDRIVE_ROOT_TARGET_VOLUME_ROOT_NOT_SUPPORTED
Within Windows cloud-file and sync-engine infrastructure, E_SKYDRIVE_ROOT_TARGET_VOLUME_ROOT_NOT_SUPPORTED reports that the sync root was pointed at a volume root instead of a child folder. Diagnosis of this result should follow the original owner and generation rather than treating the visible symptom as the cause.
Mechanism behind the code
During a this result investigation, a Windows sync engine coordinates local NTFS objects, provider metadata, remote identifiers, quota and naming rules, placeholder hydration, network authentication, and asynchronous upload or download state. The same Explorer action can cross several of those boundaries, so diagnosis must retain the first failing stage rather than treating every code as a generic connectivity problem.
A provider root needs a bounded directory it can own without taking responsibility for the entire volume., the volume root also contains system and unrelated user objects outside the sync engine’s namespace.
The first owner to inspect is the local sync root, placeholder state, file-system operation, provider request, network exchange, account policy, or remote storage operation that produced the HRESULT.
High-value telemetry
| Capture | Diagnostic value |
|---|---|
| Requested path and canonical root for it. | This provides a stable comparison across retries or another machine and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Volume GUID path for it. | This identifies the exact object or resource generation involved and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Existing child folders for it. | This places the failure on the lifecycle or transaction timeline and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Registration request for it. | This separates caller input from environment and service state and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
Decision table
- Second supported path for the same stable item: for it, a changed result separates retained object, connection, path, host, or device state from the original input. Hold constant: for it, keep account, remote item version, and client build fixed.
- Reduced failing operation: If this result follows the reduced step, the rejecting transition is localized. Hold constant: for it, retain requested path and canonical root and remove only unrelated work.
- Targeted corrective control: Use this as a diagnostic branch rather than a blanket workaround: create a dedicated child directory. Hold constant: for it, keep the original this result sample available for the final regression test.
Safe reduction procedure
When it is returned, use a disposable control object, repository copy, file, or device association where the subsystem permits it.
- First: Create a dedicated child directory.
- Next: Apply least-privilege ACLs to that directory.
- Then: Register the child path, not the drive root.
- Finally: Test provider boundary handling.
Do not erase the distinction
During a it investigation, FILE_SYSTEM_NOT_SUPPORTED concerns the volume format; this code rejects the path level even on supported NTFS.
Do not hide the root behind a trailing component, junction, or alternate path syntax.
Successful outcome
Verify it with the original scenario, one boundary case, and one deliberate failure; success means a dedicated folder registers and only its subtree is observed and synchronized.
Technical references
The references below define the API family or storage/protocol behavior used to interpret it.
- Microsoft: Build a Cloud Files sync engine
- Microsoft: Determine cloud placeholder state
- Microsoft: Restrictions and limitations in OneDrive and SharePoint
- Microsoft: StorageProviderSyncRootManager
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