If you don’t want to install Chrome OS Flex right away on your PC, try it out first. Then you can use your bootable drive for that as well. For this, follow the below steps: First, connect your USB drive to your computer and boot into the Chrome OS Flex. Then click on the Get Started button to continue. Next, you will find a Try it first option, click on it and follow the onscreen steps to try out ChromeOS Flex.