Batocera.linux is an open-source, purpose-built operating system for retro gaming. It packages multiple emulators and front-ends into a single, plug-and-play image that you can write to a USB drive or microSD card to turn a PC, single-board computer, or dedicated machine into a retro console. A 32GB Batocera image is a common choice because it balances space for the OS, numerous console cores, and room for game ROMs and multimedia without requiring high-end storage.