1, there are three types of USB flash drive interface, respectively: USB1.0, USB2.0, and USB3.0, three can be *** use.
2, the main difference between these three is that the transfer speed is different.
(1) USB1.1 is the more common USB specification, its high-speed mode of transmission rate of 12Mbps, low-speed mode of transmission rate of 1.5Mbps (b is the meaning of Bit), b/s generally indicates the bit transmission speed, bps indicates the bit transmission rate, numerically equivalent. b/s and b/s, BPS (bytes per second) and bps (bits per second) Not to be confused. 1MB/s (megabytes per second) = 8Mbps (megabits per second), 12Mbps = 1.5MB/s, most MP3s are of this interface type.
(2) The USB 2.0 specification evolved from the USB 1.1 specification. It achieves a transfer rate of 480Mbps, which translates to 60MB/s, enough to meet the rate requirements of most peripherals, and the Enhanced Host Controller Interface (EHCI) in USB 2.0 defines an architecture that is compatible with USB 1.1.
(3) The theoretical speed of USB 3.0 is 5.0Gb/s, which is actually only 50 percent of the theoretical value, and that's close to 10 times the speed of USB 2.0. The physical layer of USB 3.0 is encoded in 8b/10b, which calculates the theoretical speed of 4Gb/s, and the actual speed is also deducted from the protocol overhead, which is less than that of 4Gb/s. USB 3.0 can be widely used in PC peripherals and other peripheral devices. It can be widely used in PC peripherals and consumer electronics.
Extended information
The four wires of the usb interface are generally distributed as follows, and it should be noted that the positive and negative poles should never be reversed, or else it will burn out the usb device or the computer's Southbridge chip: black line: gnd red line: vcc green line: data+ white line: data-
USB interface definition and color
General arrangement is: red, white, green and black from left to right
Definition:
Red-USB power: marked -VCC, Power, 5V, 5VSB words
White- USB cable: (negative) -DATA-, USBD-, PD-, USBDT-
Green - USB cable: (positive) -DATA+, USBD+, PD+, USBDT+
Black -Ground: GND, Ground
Baidu Encyclopedia-USB Interface