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The newest USB standard, USB 3.0 or “SuperSpeed USB," provides vast improvements over USB 2.0. USB 3.0 promises speeds up to 5 Gbps, about ten times that of USB 2.0.... more/see it now
USB 3.0 uses a sync-n-go technology that minimizes user wait time. USB 3.0 adds a physical bus running in parallel with the existing 2.0 bus. It has the flat USB Type A plug, but inside there is an extra set of connectors, and the edge of the plug is blue instead of white. The Type B plug looks different with an extra set of connectors.
USB 3.0 cable contains nine wires, four more than USB 2.0, which has one pair for data and one pair for power. USB 3.0 adds two more data pairs, for a total of eight plus a ground. These extra pairs enable
USB 3.0 to support bidirectional asynchronous, full-duplex data transfer instead of USB 2.0’s half-duplex polling method.
USB 3.0 is much more power efficient than USB 2.0. It provides 50% more power than USB 2.0 (150 mA vs 100 mA) to unconfigured devices and up to 80% more power (900 mA vs 500 mA) to configured devices. It is also better at conserving power, when compared to USB 2.0, which uses power when the cable or device isn’t being used. With USB 3.0, when devices are idle, it doesn't broadcast packets or perform polling.
USB 3.0 is completely backwards compatible with USB 2.0. Applications built to the USB 2.0 spec will work seamlessly with USB 3.0. collapse
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