The theoretical maximum data rate in USB 2.0 is 480 Mbit/s (60 MB/s) per controller and is shared amongst all attached devices. Some chipset manufacturers overcome this bottleneck by providing...
USB version 1.1( sometimes called Basic speed USB or Orginal USB) allows for two speesd,1.5 Mbps and 12 Mbps. USB version 2.0 (sometimes called hi-speed USB or USB2) allows for up to 480Mbps.