USB was introduced in 1996, by Intel, Compaq, Digital, IBM, and Northern Telecom. Then the USB technology began to evolve in terms of data transfer speeds, so comes the second generation of USB. Better known as the USB version 2.0 (USB 2.0). Launched in April 2000 and the use of standard USB-IF (Implementers Forum) at the end of 2001. Several large companies are developing USB 2.0 is Hewlett-Packard, Intel, Lucent (now LSI Corporation), Microsoft, NEC, and Philips. Along with the increased use of external devices and the need for higher speeds. Then to the third generation USB launched in 2007. USB to third generation is known as USB version 3.0 (USB 3.0).
In terms of speed of data transfer, development of data transfer speed of USB version of the first to the third version, the difference is enormous. USB 1.0 data transfer speeds up to 12 Mbit / s. Speed USB 2.0 data transfer to achieve 480 Mbit / s. While the data transfer rate for USB 3.0 up to 5 Gbit / s.
USB 3.0 uses the technology of data transfer both directions (full duplex), so it can read and write data simultaneously (simultaneously). USB 2.0 and USB 1.0 does not support bi-directional technology.
USB 3.0 connector with USB 2.0 (standard), but the cable in it will be more, there are four additional cable channels than USB 2.0 (total of nine cable channels).
USB 3.0 compatible with USB 2.0, USB 2.0 device so that it will be used in USB 3.0 port and it will run at USB 2.0 standard. But not vice versa, USB 3.0 devices can not be installed on a USB 2.0 port.
Until now, the USB version 3.0 is the most advanced technology.