The external hard drive must also be configured to be bootable, which involves creating a boot sector and loading the necessary system files. This can be achieved using specialized software, such as Rufus or UNetbootin, which can create a bootable Windows installation on the external hard drive.
Running a full version of Windows from an external hard drive allows you to carry your personal operating system, complete with your settings, wallpapers, and applications, and boot it on almost any PC. run windows from external hard drive