This report outlines the procedure to install and run a full version of Windows from an external hard drive (HDD/SSD). Unlike a standard installation, this configuration allows the user to boot the operating system on different computers (subject to hardware compatibility). The report covers prerequisites, a step-by-step installation guide using native Windows tools and third-party software, potential performance limitations, and security considerations.

I partitioned the drive, clearing off enough space for the OS. I restarted the laptop, jamming the USB stick in. The blue Windows logo appeared. I clicked "Install Now."

Use this method if Rufus is not an option.

“Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks.”