How to install Windows on an external drive

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Thanks to the speed of USB 3.1 and Thunderbolt 3 connections, it’s now possible for an external hard drive to match the read and write speeds of an internal drive. Combine that with a proliferation of external SSDs, and for the first time, running Windows off an external drive is viable.

There are a few reasons you might want to do that:

  • You have a work laptop that you’re not allowed to make many changes to, but you want to take games or other non-work sanctioned software with you when you travel.
  • You want to run multiple operating system installations on the same machine, but don’t have enough space to split your internal drive into multiple partitions.
  • You’re running an enterprise version of Windows that comes with the Windows To Go feature, and have a certified installation drive, so you can create a portable installation that will work on any computer.

Before we start, let’s get the bad news out of the way: Windows will refuse to install on an external drive if it knows that’s what you’re doing. But there are a few ways around this, including emulation via tools like VMWare. The easiest workaround is an application called WinToUSB.

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