WinToUSB (also called Windows To USB) is the best free Windows To Go Creator which allows you to install and run a fully-functional Windows operating system on an external hard drive, USB flash drive or Thunderbolt drive. It is so easy and efficient, with just a few simple steps and a few minutes, you can create your first portable Windows 10/8/7 directly from an ISO, WIM, ESD, SWM, VHD, VHDX image file or a CD/DVD drive, or you can use it to clone an existing Windows OS installation (Windows 7 or later) to a USB drive or Thunderbolt drive as portable Windows. WinToUSB also supports creating a Windows installation USB flash drive from a Windows 10/8.1/8/7/Vista/2016/2012/2010. Oh, WinToUSB also supports creating a bootable Windows PE USB drive, it can help you transfer the contents of Windows PE to a USB drive and make the USB drive bootable. WinToUSB's key features include: Easy-to-use wizard interface that provides step-by-step instructions for creating a Windows To Go USB or Thunderbolt drive. Creation of Windows To Go from an ISO/WIM/ESD/SWM image file or CD/DVD drive. Clone an existing Windows OS (Windows 7 or later) to a USB or Thunderbolt drive as a Windows To Go Workspace. Use of a Non-Enterprise Edition of Windows 10/8.1/8/7 to create Windows To Go Workspace. Creation of Windows To Go on Non-Certified Windows To Go USB Drive. Clone Windows between disks with different sector sizes. Support for creating VHD-based/VHDX-based Windows To Go Workspace. Support for creating Windows installation USB drives.