- USB 1.0: Released in January 1996.
Specified data rates of 1.5 megabit/s (Low-Speed) and 12 megabyte/s (Full-Speed). Did not anticipate or pass-through monitors. Few such devices actually made it to market. - USB 1.1: Released in September 1998.
Fixed problems identified in 1.0, mostly relating to hubs. Earliest revision to be widely adopted. - USB 2.0: Released in April 2000.
Added higher maximum speed of 480 Megabit/s(60 MBPS) (now called Hi-Speed). Further modifications to the USB specification have been done via Engineering Change Notices (ECN). - USB 3.0 is the third major version of the Universal Serial Bus (USB) standard for computer connectivity. Among other improvements, USB 3.0 adds a new transfer mode called "SuperSpeed" (SS), capable of transferring data at up to 5 Gbit/s (625 MB/s), which is more than ten times as fast as the 480 Mbit/s (60 MB/s) high speed of USB 2.0. Beside different connectors used on USB 3.0 cables, they are also distinguishable from their 2.0 counterparts by either the blue color of the ports or the SS initials on the plugs.USB 3.1-A successor standard named USB 3.1 was released in July 2013, providing transfer rates up to 10 Gbit/s (1.25 GB/s, called "Super Speed+"), which effectively put it on par with the first version of Thunderbolt.
USB 2.0
[NOTE- 1 MEGABIT= 1000000 BITS=1000 KILO BITS]
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