Different for USB 2.0 And USB3.0

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    Does the USB interface protocol make you confused? Both the USB interface 2.0 and the USB 3.0 interface seem to be the same and compatible. However, 2.0 is not upward compatible with the speed of 3.0. This is because USB3.0 adopts a 9-pin design, and the transmission speed reaches 4.8Gbps, which is 10 times that of USB2.0. The 3.0 standard has better compatibility performance. So what are the specific differences between USB 2.0 and USB 3.0?

    The author has compiled the following 6 differences for you:

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    • The difference in appearance?
    • What is the difference in transmission rate?
    • What is the difference between Data band width?
    • What is the difference from the usb socket pin?
    • What is the compatibility difference?
    • What is the difference in functional loss?

    1.The difference in appearance:

    USB2.0 is generally a white or black Connector, usb3.0 is a blue Connector; the interface on a computer is also of the same nature, black Connector 2.0 specifications, blue Connector 3.0 specifications; from USB From the appearance of the male port, the USB3.0 interface part is marked with the “SS” style, while the USB2.0 is only marked with the ordinary USB general logo.

    Qq图片20210412144918

    2. The difference in transmission rate:

    The transmission speed of usb3.0 is 4.8Gbps, which is 10 times that of usb2.0, that is, 4.8Gbps=600MB/S; the transmission speed of USB2.0 is 480M per second and 3.0 is 5G per second. If you use an ordinary copper data cable, 3.0 can transmit about 30 meters, and 2.0 can only transmit about 3 meters, and data loss will be serious if it is farther away. The USB3.0 data cable sold by Microsoft Somatosensory website can pass 300 meters. But the two standard interfaces are universal, 2.0 can be compatible with 3.0, but 2.0 is not compatible with the speed of 3.0;

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    3.Data bandwidth:

    Band width is also called frequency width, which refers to the amount of data that can be transmitted at a fixed time, that is, the ability to transmit data in a transmission pipeline. Data bandwidth can be easily understood as the speed of accessing the network. The data bandwidth of USB3.0 is ten times that of USB2.0, which can reach 5Gb/s (480MB/s), and the synchronous transmission bandwidth can also reach 384MB/s. This is one of the main differences between USB3.0 and 2.0.

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    4. From the perspective of usb socket pins:

    USB2.0 adopts a 4-pin design, and usb3.0 adopts a 9-pin design, which is more powerful than usb3.0。 3.0 adds 5 wires on the basis of 2.0. New type c Connector is designed to be blue internally and Micro-B 3.0 is extended by a section on the original basis.

    Qq图片20210412151503

    USB Type C

    微信图片 20210412152044

    5. Compatibility difference:

    For the boot compatibility during the USB 2.0 and USB3.0 U disk installation system, it is obviously that the compatibility of the usb3.0 standard is better.

    6.The difference in functional loss:

    When the data transfer volume is 20MB/s, the power consumption of USB 3.0 is about 25% lower than that of USB2.0; USB data cable 3.0 is more energy-efficient than USB data cable 2.0, and can be used for temporarily waiting devices Power saving mode;

    The USB protocol naming method is confusing, everyone pay attention to distinguish.

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