When you boot into MiniOS, you aren't loading the full Windows registry, driver database, or user profile system. Instead, you are loading a minimal kernel and a set of portable applications directly into your system RAM. The magic of a MiniOS ISO is that it runs entirely in RAM . Once the ISO boots, you can physically remove the USB drive. The OS continues to run at near-native speed.
Have you used a custom Windows PE environment before? Which build do you trust? Let me know in the comments (and remember to backup your data first). windows 10 iso minios
Most MiniOS builds disable Windows Update and Windows Defender to save space. This means if you connect to the internet, you are vulnerable to any zero-day exploit. When you boot into MiniOS, you aren't loading
Creating and distributing a modified Windows ISO violates Microsoft's EULA. You will never find an official Microsoft MiniOS. Once the ISO boots, you can physically remove the USB drive