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macUSB is a one-click tool that turns a modern Mac (Apple Silicon) into a device capable of creating bootable USB installers for older Apple computers. It automates the full process of creating bootable media—detecting the installer version from .dmg, .iso, .cdr, or .app files, formatting the drive, and copying files while applying automatic fixes for legacy systems. By enabling installers for machines over a decade old (e.g., OS X Lion) from current Macs, it saves time and preserves legacy compatibility.
AI named macUSB in January 2026.