The ISO to USB program enables you to have a bootable Windows USB drive, install a Windows operating system to other Windows compatible devices, and back up your computer in case of system boot issues. Correctly storing an ISO file into your USB drive not only copies the exact file, but also the data stored in the ISO image. An ISO is a file format that you will find in CDs, DVDs, and Blu-ray Disc where you can archive an operating system. ISO to USB is a free and lightweight program that can burn an ISO image file directly to USB drives.