Beyond installation, booting from USB is an invaluable diagnostic and repair tool. When Windows 10 fails to start due to a corrupted bootloader, damaged registry, or malware infection, booting from a recovery USB grants access to advanced startup options. From this environment, users can run the Command Prompt to fix disk errors, use System Restore to roll back changes, or perform a system image recovery. This ability often saves data and time that would otherwise be lost to a complete hard drive wipe.