what is the difference between a usb 2.0 flash drive and a usb 3.0 flash drive?
The USB 2.0 standard offers a theoretical maximum signaling rate of 480 megabits per second, while USB 3.0 defines a maximum rate of 5 gigabits per second. In other words, USB 3.0 is theoretically more than ten times faster than USB 2.0. ... For example, USB drives will be limited by the speed of their flash memory.