There are a few reasons you’d want to boot your computer from a USB device. You might be trying to install Windows 10 or you might want to use a disk partition or clone utility that doesn’t run within Windows.
There are several things that need to happen for your PC to boot from a USB drive. First you need a USB stick that has been set up to be bootable. Plus, your laptop or PC must be configured to look for USB devices before booting from its main hard drive. Here’s how to make all that happen.