It is grounded on the state of affairs. Suppose you can tolerate the highest speed of whatever version of an external drive, then go for it. This is only applicable if its speed is slower than the operating system’s speed fitted on a connected USB drive. It’s perhaps not the finest idea if you plan to use it as your major OS unless your computer does not have internal drives and you are relying on what you’ve got. However, as a secondary OS that you will not be utilising most of the time, it’s just a good idea. Remember, some operating systems, such as Microsoft Windows, cannot mount on an external drive and may fail to run.