WinUSB

WinUSB is a free portable program that allows you to create bootable USB media with the Windows operating system, in most cases without prior formatting. It works with both physical DVDs and ISO images and automatically detects the version of the operating system after selecting the source. Windows 7, 8 (8.1), 10 and 11 are supported, as well as WinPE images, Ubuntu Linux and rescue disks such as AVG Rescue CD and ESET SysRescue Live-CD.

In the start window of the program you choose the medium to write to. The connected USB drives are displayed in a convenient drop-down list, which also indicates the file system and the amount of free space. If you have enough free space on the external drive, you can write several versions of Windows to it at once (create a multi-boot drive). In this case, WinUSB creates a convenient boot menu with which users can choose the operating system to install when booting. Both UEFI and BIOS boot modes are supported.

After you select the desired media and specify all versions of Windows to be written, the program offers to format the drive. As mentioned before, this step can be skipped when there is enough free space, and writing starts right away. If you do decide to format your drive, WinUSB lets you select one of the following file systems: NTFS, exFAT and FAT32.

One main benefit of using WinUSB is creating bootable media with multiple Windows operating systems without formatting and with automatic version detection.

That's how you can create a multiboot USB flash drive in just a few simple steps. The built-in boot manager lets you browse, add and remove distributions later, and the optional DriverPack Network package adds Wi-Fi and LAN drivers for use right after Windows is installed. For those who have problems finding the original Windows images, the program has a "Get Windows ISO" link that leads to official operating system images from Microsoft.