Replace the original install.wim with your new install.esd (rename it to install.wim —Setup doesn't care about the extension). Then use oscdimg to create a bootable ISO:
An ISO file is a sector-by-sector copy of an optical disc. Standard compression (like ZIP or RAR) can shrink Windows 7 to about 1.8 GB—but not 900 MB. To reach 900 MB, the ISO uses (like LZMA2 or XZ) combined with file removal. windows 7 compressed iso 900 mb fixed
Modified ISOs are not official Microsoft products. They may contain pre-installed malware or "backdoors." Always scan the ISO with a reputable antivirus before use. Replace the original install
The built-in repair environment is usually stripped out. To reach 900 MB, the ISO uses (like
These are not simply compressed files; they are heavily modified versions of Windows. Enthusiasts use deployment tools to permanently remove core operating system features.
Leo’s fingers trembled over the keyboard. He slammed the power button. The screen went black. He held it for ten seconds. Twenty. The fan spun down. Silence.