Those wondering exactly how to make a bootable USB for Windows will be pleased to hear there are three generally accepted methods. Flash drives also don't get scratched, are faster to write to, and take up less space. With disk drives more or less dead, it's often the only real choice on a completely new PC. These days, a Windows 10 USB is the preferred method to perform a clean install of Microsoft's operating system. It takes just a few minutes to create a bootable Windows 10 USB, but it can save countless hours if your OS breaks down and you don't have a spare PC to hand. No matter how technically-minded you are, it's always smart to have a Windows 10 boot stick to hand. 3 How to Create a Windows 10 Bootable USB fro ISO via the Windows 7 USB/DVD Download Tool (Legacy).2 How to Put Windows 10 on a USB Drive via ISO with Rufus (Legacy or UEFI).1 How to Create a Windows 10 USB via the Media Creation Tool (UEFI or Legacy).