USB3.0 is backward compatible with USB2.0, and of course USB2.0 is also compatible with USB3.0 devices. In fact, to meet USB3.0 transmission, two conditions must be met. First, the computer motherboard supports USB3.0, and the other device used must also support USB3.0. Nowadays, only some new U disks and mobile hard disks support USB3.0, so if Connect a device that supports USB3.0 (such as a USB flash drive) to a computer that supports USB3.0 motherboard, then you can achieve high-speed transmission of USB3.0 data.
USB3.0 data cable, in fact, USB 3.0 and 2.0 only refer to the difference in the standard transmission rate of the interface. A USB3.0 computer means that the USB interface on the computer motherboard supports the 3.0 standard transmission rate, and can also be backward compatible with 2.0. In other words, if the computer motherboard interface is U For SB3.0, we take a previous U disk (previously U disks only supported USB2.0) and connect it to the USB3.0 interface, but the transmission speed is still only the speed of USB2.0, because even if the motherboard meets the requirements, the U disk It has not been reached, so it can still only reach the transmission speed of USB2.0. On the other hand, if you take a USB3.0 U disk and connect it to an old computer (using a USB2.0 interface), the transfer speed will still only be USB2.0, because the motherboard only supports a maximum speed of 2.0.
In general, the current USB3.0 and USB2.0 interfaces are actually the same, but the transmission speed is different. When we look at the USB3.0 and USB2.0 interfaces on the computer motherboard, we will find that in fact The appearance and size of the two are the same, except that the internal color of USB3.0 is blue, and the internal color of USB2.0 is black, as shown in the figure below:
Comparison of the appearance of USB2.0 and USB3.0 interfaces. For everyone, as long as USB3.0 is compatible with 2.0, and to meet the high-speed data transmission requirements of USB3.0, it must also meet the USB3.0 interface of the computer motherboard and the external interface. USB devices must also support USB3.0. If any one device supports only one device, it will still only reach the speed of USB2.0.
Simple summary:
USB3.0 devices can be plugged into the 2.0 interface, but the transmission speed is 2.0
Of course, USB2.0 devices can be plugged into the 3.0 interface, but the transmission speed is also 2.0.
Only USB3.0 devices can be plugged into the 3.0 interface, but the transmission speed is 3.0.
When we use a USB2.0 standard device in a USB3.0 interface, even if the device does not support USB3.0 transmission, the USB3.0 interface can still be used. The difference is that it does not support 3.0 high-speed transmission and can only use 2.0 transmission speed. Transfer in USB3.0.
The above is all the content of USB3.0 compatible with 2.0. I hope it can help friends in need.
