NTSTATUS 0xC000046F (STATUS_COMPRESSION_NOT

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The compressor determined that the object would not become smaller enough to justify compression.

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STATUS_EXTERNAL_BACKING_PROVIDER_UNKNOWN	STATUS_DATA_CHECKSUM_ERROR

STATUS_COMPRESSION_NOT_BENEFICIAL

Compression would not save storage for this object

Already-compressed media, encrypted data, high-entropy archives, and very small objects can expand or gain no useful reduction when compressed again. This status reports an efficiency decision rather than corrupted data.

A caller should normally keep the object uncompressed and continue. Repeatedly trying other compression settings can waste CPU and may increase fragmentation without changing the underlying entropy.

What to inspect

Compare allocated size and logical size before and after any trial operation.
Recognize formats that are already compressed or encrypted.
Treat this as a valid no-compression outcome unless policy explicitly requires a different storage representation.

References

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