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ERROR_NOT_SUPPORTED_ON_DAX
DAX volume semantics do not support this operation
ERROR_NOT_SUPPORTED_ON_DAX is a Win32 system result. DAX allows applications to access persistent memory with reduced filesystem caching. Some operations that depend on buffered I/O, paging, or ordinary block-device behavior are incompatible with DAX semantics.
What the result means
The requested operation is not supported on a direct-access (DAX) volume. For ERROR_NOT_SUPPORTED_ON_DAX, keep the symbolic name, numeric value, and failing operation together in diagnostics; that combination distinguishes the exact failure path from nearby system results.
What to check
- Confirm that the target volume is DAX-enabled.
- Identify which API or filesystem feature is unsupported in direct-access mode.
- Check whether the application assumes buffered I/O, cache-manager behavior, or ordinary memory mapping.
- Review whether the workload truly requires DAX for this data.
Recommended handling
Use a DAX-compatible code path or move the operation to a non-DAX volume. Do not disable DAX without considering durability, performance, and application consistency requirements.
Developer notes
Detect volume capabilities before selecting algorithms. Persistent-memory writes need explicit consistency and flush semantics; falling back must preserve correctness, not only make the API succeed. When a Win32 API reports ERROR_NOT_SUPPORTED_ON_DAX, capture GetLastError() immediately; subsequent cleanup, formatting, or logging calls can replace the thread-local value.
References
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