A Chromebook recovery drive is useful if the Chrome OS becomes damaged, perhaps due to a failed software update. This article describes how to build the recovery media for the device. This can be done through Windows, Mac, Linux or directly from the Chromebook. It is suggested that you use a Windows PC to complete this process and this guide assumes you will do that. While this process is happening, you should continue with the set up on the Chromebook.
You will also need a USB flash drive (or SD Card) of 4GB or more for this and the Internet download is around 350MB.