What does HRESULT 0x80042918 (VDS_E_COMPRESSION_NOT_SUPPORTED) mean?

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Description:

The requested VDS format asks for compression that the selected file system does not support.

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VDS_E_FORMAT_NOT_SUPPORTED	VDS_E_VDISK_NOT_OPEN

VDS_E_COMPRESSION_NOT_SUPPORTED

VDS format APIs can request compression when creating a file system. IVdsVolumeMF2::FormatEx exposes bEnableCompression, while format-support metadata includes capability flags describing file-system behavior. Microsoft notes that the compression parameter is ignored when the file system is not NTFS for that API path, and VDS also publishes a specific compression-not-supported HRESULT.

Why this state matters

The right diagnostic is to pair the requested file-system type with its advertised format-support flags and the exact format method used. Do not treat compression as an independent volume attribute that can always be enabled after choosing any file system. A provisioning layer should validate this option before starting the asynchronous format so the error does not appear after destructive work has begun.

Diagnostic focus

Log the requested file-system type, revision, allocation-unit size, and compression option.
Query VDS_FILE_SYSTEM_FORMAT_SUPPORT_PROP.ulFlags for the chosen format target.
Disable compression or select a file system that advertises the required capability instead of blindly retrying.
If format succeeded with a compression warning, preserve that result separately from this precondition/error status.

Technical references

IVdsVolumeMF2::FormatEx · IVdsVolumeMF3::FormatEx2 · QueryFileSystemFormatSupport · VDS_FILE_SYSTEM_FORMAT_SUPPORT_FLAG · VDS_FILE_SYSTEM_FORMAT_SUPPORT_PROP

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