Starting with Windows 7, Windows To Go is a feature of Windows Enterprise versions for people who bring their laptops to work. Windows To Go boots the PC into a company-configured Windows desktop from a USB or external storage drive. When first booted, it detects the required drivers for the machine's hardware and installs them. At the end of the day, the drive is removed, and the laptop reverts to its original state.
Only Certified USB Drives
Windows To Go disables the storage drive in the employee's machine, and only the USB or external drive is used. USB drives require a minimum of 32GB and Windows To Go certification. See Windows 8