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VDS_E_EXTEND_UNKNOWN_FILESYSTEM
VDS_E_EXTEND_UNKNOWN_FILESYSTEM This HRESULT is a file-system recognition failure in an extend operation. The VDS volume can exist and have a coherent storage layout while the file system on it is unknown to the component responsible for coordinated extension. This is different from VDS_S_EXTEND_FILE_SYSTEM_FAILED, where the volume extension succeeds but subsequent file-system growth fails.
What the VDS state means
VDS documentation describes extend and shrink as storage-management operations and identifies explicit file-system support boundaries in its APIs. The caller should identify the actual file-system type instead of assuming NTFS from a drive letter or from the history of the volume. RAW, damaged, vendor-specific, or otherwise unrecognized content changes the safe action.
Diagnostic focus
- Query the volume and file-system properties and confirm the current recognized file-system type before changing capacity.
- Do not retry by allocating more extents; the failure occurs because the file system is not recognized for the coordinated extend operation.
- Check whether the volume is intentionally RAW/unformatted or whether file-system damage caused recognition to fail.
- If a vendor or filter-managed file system is involved, use that technology’s supported growth procedure rather than assuming the legacy VDS path can resize it.
Technical references
MS-VDS error codes · IVdsVolume · VDS_VOLUME_PROP · VDS interfaces and structures · VDS_ASYNC_OUTPUT_TYPE
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