Windows To Go is a new feature in Windows 8 Enterprise Edition that enables users to boot a full version of Windows from external USB drives on host PCs. See the Windows To Go Step by Step wiki article for instructions about creating a Windows To Go drive. Once the drive is created, you will need to boot it on a host computer. PCs certified for Windows 7 or Windows 8 have hardware that is compatible with running Windows To Go.
If the host computer is running Windows 8, there is a setting called Windows To Go Startup Options that configures the computer to boot from USB. However, if you only want to boot from USB one-time only or are using a host computer running Windows 7 you will need to configure the BIOS settings manually to enable the computer to boot from the Windows To Go drive.
The method that you use to configure the BIOS setting differs based on the computer manufacturer. This article is sharing the methods for some of the manufacturers that we have tested Windows To Go with, but are not guaranteed to match precisely to any given configuration. If your computer doesn't provide the options described, check with your computer manufacturer for any BIOS updates that might be available.
You enter the BIOS settings for your computer before the operating system starts through using what is called a "hotkey" - these are function keys that have been mapped to utilities by the firmware manufacturers. The following table provide a reference to some well-known hotkeys:
Note: Pressing ESC will bring up a menu with all hotkey options
F2 or blue “Thinkpad” button
Press F2, select the 2nd option
F10 (Not always implemented)
What the BIOS Is and How to Access it on a Dell™ Computer - KB Article - 148562
Updating the BIOS - HP
How to access the BIOS - ThinkPad
How to update the BIOS on Toshiba notebooks
Acer Service and Support
How to access, modify, or exit the BIOS setup utility on a computer. - Sony
How To Use the BIOS Setup Utility - Samsung