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File sizes are included in the YMODEM header when sending both binary and text files. Thus files transferred via YMODEM should preserve their exact length. File modification times may also be present in the YMODEM header.
YMODEM can fall back to smaller packets when necessary but there is no backward compatibility with XMODEM's error detection.
This article was originally based on material from the Free On-line Dictionary of Computing, which is used under the GFDL.