How to boot multiple operating systems on one usb drive?

You can use MultiBootUSB to solve the challenge of how to boot multiple operating systems. It is a free, open-source, cross‑platform utility designed for creating multiboot USB drives. Compatible with both Windows and Linux, it supports storing multiple ISO files on a single USB drive and offers a straightforward graphical interface. Many users rely on it to boot different systems without repeated formatting or complex configuration.

Step 1: Prepare an 8GB USB drive to back up all data.

Step 2: Download and run the software; it will automatically detect your USB drive.

Step 3: Select the target USB drive from the list.

Step 4: Click Browse to add the operating system ISO image file to be included.

Step 5: Click Install to write the bootloader and add the selected ISO file.

Step 6: Wait for the process to complete; do not remove the USB drive during creation.

Step 7: Restart the computer and set the USB drive as the boot device in the BIOS/UEFI.

Cons

• Limited UEFI boot support, with comparatively lower stability than modern tools.

• Potentially slower write speeds when handling large ISO files.

• Secure Boot functionality is not supported by default.

It is a dependable, lightweight and free solution for creating multi-boot USB devices. Despite certain limitations regarding compatibility with UEFI and newer systems, it remains an ideal choice for users wanting a simple, open-source tool that shows how to boot multiple operating systems and manage them all from a single USB drive.