USB 3 10x faster data transfers then USB 2.0

usb 3.0

The next phase in the PC revolution is the USB (Universal Serial Bus) 3.0 version. It has arrived in the market with companies like Seagate and Western Digital offering hard drives with USB 3.0 speed support.  Promising  data transfer 10 times faster than the predecessors. Few of the best features includes, it’s support for backward compatibility.  USB 3.0 will have dedicated lines going in and out, however, so that communications between host and device can happen at the same time.

The other major improvement is in the data-transfer rate, which will be close to 5 gigabits per second (Gbps) in each direction (officially targeting 4.7 Gbps), compared with the 480 megabits per second (Mbps), one-way, that USB 2.0 offers. The symbol for USB 3.0 will be a blue line on the port.

Compare USB 2.0 to USB 3.0 features, review

SuperSpeed USB 3.0 USB 2.0
Signaling Dual-simplex four wire differential signaling Half-duplex two wire differential signaling
Data Flows Simultaneous bi-directional data flow Unidirectional data flow + negotiated directional bus transitions
Cables 6 Total
4 x SuperSpeed
2 x non-SuperSpeed
2 x low,full,high-speed
Traffic Flow Asynchronous Polled
Packet Traffic Explicitly routed Broadcast to all devices
Power Management Multi-level which supports
idle, sleep, and suspend.
Port-level that has two levels of entry/exit latency
Bus Power 50% more than USB 2.0
80% more with configured power

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