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Square openings help USB-A plugs stay securely connected in ports
The two square holes on a USB-A plug are part of a retention mechanism that helps keep the connector securely in its port. Spring-loaded clips inside the port fit into the holes, reducing accidental disconnections during charging, file transfers or use of peripherals.
USB-A was designed in the late 1990s as a widely compatible connection for devices such as keyboards and printers, but it can only be inserted one way. USB-C uses tabs inside the port that latch onto notches in the plug, allowing its reversible design without square holes. Although USB-C is now common, USB-A remains widely used in offices and accessories.
In short
- USB-A’s square holes help its plug stay in place.
- Clips inside the port lock into the holes.
- USB-C uses a different retention design.
Read the full article at the source →
Originally published by Engadget as “Why do some USB connectors have those 2 square holes?”.