Not merely the limited functionality of WinPE or WinRE. It's "Windows-to-Go", introduced in Windows 8.0 which had the full Windows functionality contained on t

Not merely the limited functionality of WinPE or WinRE. It's "Windows-to-Go", introduced in Windows 8.0 which had the full Windows functionality contained on the USB stick, if the bootable stick met the high-performance requirements and had firmware indicating to Windows that the USB stick was not a "Removable Device". This was gradually deprecated for the most part: https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/deployment/windows-to-go/windows-to-go-overview https://learn.microsoft.com/en-us/previous-versions/windows/...