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| ERROR_NOT_REDUNDANT_STORAGE | ERROR_COMPRESSED_FILE_NOT_SUPPORTED |
ERROR_RESIDENT_FILE_NOT_SUPPORTED
The operation cannot be used on a resident file
ERROR_RESIDENT_FILE_NOT_SUPPORTED indicates that a file-system operation requires nonresident data, while the file’s contents are stored directly in metadata records. Very small files can be resident on file systems such as NTFS.
Checks
- Identify the exact control code or maintenance operation.
- Confirm that ordinary reads and writes still succeed.
- Do not infer file size solely from resident status.
- Review whether the operation is optional for small files.
Fallback
Skip the unsupported optimization or use a standard file I/O path. Artificially changing the file only to force nonresident storage is rarely justified.
References
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