Windows To Go was officially introduced as a feature for Enterprise editions of Windows 8 and 10 to run a portable OS from a USB drive, Windows XP

I nod. “Don’t ever unplug that drive. Don’t run Windows Update. And for the love of God, don’t let anyone sneeze near the USB port.”

Unless you work for a legacy OEM, this route is overkill for most users.

: Microsoft officially discontinued Windows To Go in 2019 (Windows 10 version 2004) due to lack of feature update support and specific hardware requirements.

I find a ghost in the machine: a German forum post from 2009. A tool called USB Multiboot 10 . It uses a hacked NTLDR and a custom usb.inf that forces XP to treat the USB as a fixed disk. But there’s a catch: the motherboard has to support USB hard disk emulation, not just removable.

There are two primary technical barriers to running Windows XP from a USB drive:

To make a portable Windows XP, you need to trick the OS into being and "Drive-Letter Agnostic" .

To understand why creating a portable Windows XP drive is difficult, we must look at how operating systems boot.

Edit boot.ini on the USB to look like this: