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Is USB 3.0 backward compatible with earlier USB standards?

Yes it is. A USB 2.0 device will be able to plug into a USB 3.0 port and will work just fine. Also, a standard A USB 3.0 plug can be inserted into a USB 2.0 A port, operating at USB 2.0 speeds. Other USB 3.0 plugs, however, are larger than their USB 2.0 counterparts, and therefore cannot be used with older-generation ports.

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