Windows error 326 (ERROR_FILE_LEVEL_TRIM_NOT

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The device or file system does not support trimming an individual file.

Could be also:
Constant	Type	OS
NDIS_NET_BUFFER_LIST_INFO_ILLEGALLY_TRANSFERRED	BugCheck Code	Windows

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ERROR_INTERMIXED_KERNEL_EA_OPERATION	ERROR_OFFSET_ALIGNMENT_VIOLATION

ERROR_FILE_LEVEL_TRIM_NOT_SUPPORTED

File-level TRIM is not supported

ERROR_FILE_LEVEL_TRIM_NOT_SUPPORTED is returned when software requests deallocation hints for a specific file but the active storage stack cannot perform that operation at file granularity.

Compatibility checks

Confirm that the file system implements the requested control code.
Check device, controller, and virtualization support for TRIM or UNMAP.
Verify that encryption, snapshots, or filter drivers do not block the feature.
Treat the capability as optional unless the application contract says otherwise.

Fallback

Continue without file-level trimming or use a supported volume-level maintenance mechanism. The error does not by itself mean normal file I/O is unavailable.

References

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