About the new USB 3.0 Standard
A major improvement in technology, the SuperSpeed USB 3.0 provides additional connectivity bandwidth (up to 4.8Gbps speed) over USB 2.0 for increasingly sophisticated peripherals that require more power. Because USB 3.0 is fully backward compatible with USB 2.0, any high-bandwidth device that works with USB 2.0 will become better if updated with video optimized USB 3.0, such as external hard drives, high-res webcams, video surveillance cameras, DisplayLink USB video, digital video cameras, digital still cameras with USB interface, multi-channel audio interfaces, high-end flash drives, and Blu-Ray drives, among others.
In addition to higher data rate speeds, USB 3.0
improves interaction between the device and the host computer. Several
changes were made to support the dual bus arrangement allowing
bi-directional data interface and two pairs of differential signals.
Power efficiency was an objective in creating USB 3.0. New power management features provide more power when needed and less power when it's not needed.
To learn more, visit http://www.usb.org.