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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
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.
High-value telemetry
- Requested path and canonical root.
- Volume GUID path.
- Existing child folders.
- Registration request.
Decision table
- Second supported path for the same stable item: a changed result separates retained object, connection, path, host, or device state from the original input. Hold constant: 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: 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: keep the original failing sample available for the final regression test.
Safe reduction procedure
Use a disposable control object, repository copy, file, or device association where the subsystem permits that safely.
- 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 an 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
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