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2.1.9 64-bit file ID

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A 64-bit file ID value uniquely identifies a file within a given volume. This identifier is generated and stored by the file system. The identifier SHOULD<10> be unique to the volume and stable until the file is deleted.

For file systems that do not support a 64-bit file ID, this field MUST be set to 0, and MUST be ignored.

For files for which a unique 64-bit file ID cannot be established, this field MUST be set to 0xFFFFFFFFFFFFFFFF, and MUST be ignored.