: Using heavy-duty compressors like 7-Zip (LZMA/LZMA2), KGB Archiver , or WinRAR at "Ultra" settings to wrap the ISO file.
Most repacks start by removing "bloatware," help files, language packs, and drivers using tools like Dictionary Size: windows 8 highly compressed repack
Using unofficial repacks poses several dangers that a formal paper should address: Transforming Windows 8 into Windows 7! - Win8to7 Demo : Using heavy-duty compressors like 7-Zip (LZMA/LZMA2), KGB