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Utilizing maximum compression settings (like 7-Zip’s LZMA2 algorithm with an ultra-dictionary size), you might manage to shrink a 3.5 GB ISO down to roughly .
While "Zip Bombs" (files that expand from kilobytes to terabytes) exist, they only contain endless lines of zeroes. A functioning, bootable Windows installation cannot be reduced to 9 MB. What Actually Happens When You Download These Files? Windows 7 Ultimate 64 Bit Highly Compressed -9.28 Mb
You are browsing the internet for a clean copy of Windows 7, and you stumble upon a link promising a "Windows 7 Ultimate 64-bit highly compressed" file size of just 9.28 MB. It sounds like a miracle. A standard Windows 7 installation ISO file is usually between 3 GB and 4 GB. Shrinking that down to less than 10 megabytes would be an incredible feat of software engineering. What Actually Happens When You Download These Files