Some tools like UltraISO use the ISZ (Compressed ISO) format to reduce image size while keeping it mountable by specific virtual drive software. Security and Technical Risks
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Often stripped of heavy background processes. How Compression Works Some tools like UltraISO use the ISZ (Compressed
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These sizes include all core system files, default drivers, fonts, languages, and the installation environment (WinPE). When compressed into a standard .iso file, the data is already lightly compressed using UDF or CDFS file system formats.