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Why do some USB connectors have those 2 square holes?
Some USB connectors, including USB-A, feature two small holes that have an important purpose. Other USB connectors lack these holes for a reason, too.
AI Summary
The original Universal Serial Bus was created in the late 1990s by a consortium that included Intel, Microsoft, NEC, IBM, Compaq, DEC and Nortel. Its first connector, the USB Type‑A plug, was built to simplify linking plug‑and‑play devices such as keyboards and printers, letting users rely on a single port and reduce the number of cables they needed. Over time the standard evolved, with newer versions like USB 4 delivering far higher power delivery and data‑transfer speeds.
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