Windows error 769 (ERROR_COMPRESSION

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: file-system compression is disabled for the target volume or object store.

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ERROR_CALLBACK_POP_STACK	ERROR_CANTFETCHBACKWARDS

ERROR_COMPRESSION_DISABLED

The volume refuses requests to enable per-file compression

FSCTL_SET_COMPRESSION can enable transparent compression only when the underlying object store supports it and has not disabled the feature. MS-FSA specifies a distinct compression-disabled status for this case. The result differs from an unsupported compression format and from a read-only volume: the request is understood, but policy or volume configuration prevents enabling compression.

Check the file-system type, volume cluster size, administrative configuration, and whether the request targets a local or remote object store. The file-system specification also notes that compression may be unavailable on volumes whose cluster size is greater than 4 KB. Do not attempt to clear the error by rewriting file attributes directly; compression state is changed through the file-system control operation.

What to inspect

Confirm the volume supports per-file compression.
Inspect cluster size and administrative compression policy.
Use FSCTL_SET_COMPRESSION rather than editing attributes manually.

References

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