What is the difference between USB2.0 and USB3.0?

Why do you say that usb3.0 is better than usb2.0? Where are the advantages? Why does everyone recommend buying usb3.0? After reading the following three elements, you will understand the difference between usb3.0 and 2.0.

  1. Data transmission
    usb3.0 introduces full-duplex data transmission. Two of the five lines are used to send data, the other two are used to receive data, and one is the ground wire. That is, USB 3.0 can read and write at full speed synchronously. Previous USB versions did not support full duplex data transfer.
  2. Data transfer rate
    The U disk is connected to the system by the USB interface, and the speed of the interface limits the data transfer rate of the mobile hard disk. At present, the maximum transmission bandwidth of usb2.0 is 480Mbps (ie 60MB/s), while the maximum transmission bandwidth of usb3.0 is as high as 5.0Gbps (500MB/s); It is 0.5A; but in practical applications, the transmission rate in the application will be slowed down for some objective reasons (such as the main control chip used in the storage device, whether the production quality of the circuit board is good, etc.).
  3. Interface
    Observe the socket of the USB (itself) and the USB socket on the computer. The color of the plastic sheet in the middle: usb3.0 – blue; usb2.0 – black. Of course, the color distinction of some devices is not standardized. For example, some non-native usb3.0 supported by the main control chip may not be blue, and some usb2.0 devices such as MP3, data cables, etc. may be black or white plastic sheets. . Also, the USB 3.0 cable will be “thicker” because the USB 3.0 data cable has 4 more internal wires than the 2.0 cable. However, this socket is a defect of USB 3.0. It contains additional connected equipment.

To sum up, usb3.0 has the advantages of fast transmission speed, convenient use, support for hot-swap, flexible connection, and independent power supply. But for device compatibility, usb2.0 is currently better.

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