This method allows for the storage of file sizes larger than 4GB. While another exFAT partition is created and used for storing the bootable ISO files. Ventoy is a Multiboot USB tool that works by creating a hidden 32MB VTOYEFI bootable partition which houses the boot menu, GRUB boot loader and core related files. It supports both legacy BIOS and UEFI boot options, and also works with UEFI secure boot. Anyone is welcome to dig in to see how it works, submit improvements, use it in their project, or branch from it. Much like the YUMI exFAT bootable USB creator, (which currently uses the VTOY bootloader), this is also open source software. This should result in a ready to boot USB device.

The ISO files are directly copied over and added to the boot menu. You simply use the GUI utility to format and prepare your thumb drive, then drag and drop your chosen ISO files onto your flash drive. Functionality is intuitive and relatively straight forward. Ventoy is another excellent Multiboot USB boot creation software tool that can be used to copy, boot and run multiple ISO files from USB.

Ventoy usb