'C:\> FORMAT C:' – relax, it's just a screen saver

FakeDOS 2.0 is a free macOS screen saver that simulates a 1990s DOS machine with pixel-perfect authenticity, featuring multiple boot modes (DOS, Linux, Commodore 64), a ghost that types commands autonomously, and realistic but completely harmless simulations of potentially destructive commands like FORMAT C: and DEL *.*. The screen saver is designed to entertain, create nostalgia, and keep coworkers away from your Mac, with all simulated actions producing no actual changes to files, disks, or system settings.