What does HRESULT 0x80042560 (VDS_E_INVALID_FS_FLAG) mean?

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the file-system flag mask contains a value not valid for this VDS operation.

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VDS_E_INVALID_DRIVE_LETTER_COUNT	VDS_E_INVALID_FS_TYPE

VDS_E_INVALID_FS_FLAG

VDS_E_INVALID_FS_FLAG means the caller supplied unsupported or malformed VDS_FILE_SYSTEM_FLAG bits. File-system flags describe properties such as compression support or current state and are not interchangeable with volume flags or formatting option flags.

Use the enumeration required by the exact method

Log the numeric flag mask and decode every set bit.
Remove flags not defined for the target Windows/VDS contract.
Do not pass VDS_VOLUME_FLAG or provider flags into file-system methods.

A provider can also restrict which otherwise defined flags it accepts. Query filesystem properties and supported format types before building the request. Masking unknown bits silently may hide a version mismatch, so report unsupported values and preserve forward compatibility by handling newly returned flags gracefully.

Filesystem flags · GetFileSystemProperties · IVdsVolumeMF

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