Distinguishing USB2.0 and USB3.0 have a knack

When we use a mobile hard drive, we find that the speed of the hard drive is faster than the U disk, but the speed of the hard drive is not the speed of the hard drive, much slower than the speed of the hard drive, but if you try to use the USB 3.0 of the mobile hard drive will find the speed of the hard drive directly with the same speed as the motherboard Can reach the upper limit speed of mechanical hard disk, no longer be restricted by the bottleneck of the interface.

The USB3.0 transmission rate of USB 2.0 10 times times USB 2.0 is Mbps, while USB 3.0 can reach 4.8 Gbps. Of course, many devices do not need such a high rate, but the hard disk and card reader devices such as the speed of the request is very high. Compared with USB 2.0, USB 3.0 will be more energy efficient. In addition, USB 3.0 is backward compatible and supports USB 2.0 devices.

USB 3.0 is compatible with older versions of interfaces that support common I/O, and will be optimized to reduce energy consumption while improving protocol efficiency in computers, consumer products, and mobile products, support rapid synchronous mobility, support for both optical and digital component specifications, and traditional USB Technical ease of use and out-of-the-it features.

Mini USB 3.0 interface will be divided into a, b two kinds of public mouth (Plug), and the mother Mouth (receptacle) will have B and ab two, from the shape, AB mother can be compatible with a and b two kinds of public mouth, at the same time, you can see, 3.0 version of the public mouth pin is 9 stitches, and 2.0 is 5 stitches. For backward compatibility with version 2.0, USB 3.0 uses a 9 pin design, where four pins and USB 2.0 are exactly the same shape and definition, while the other 5 are specially prepared for USB 3.0.

Many people who are unfamiliar with USB3.0 worry about not knowing how to identify and differentiate between the USB2.0 interface and the USB3.0 interface, so let's look at the differences by comparison:

　　USB 3.0/2.0 Interface Comparison

In fact, in front of the interface parsing has been said very clearly, the USB 3.0 standard A-type interface can be backward compatible with the USB 2.0/1.1, its size is consistent, but these two interfaces are very good distinction:

　　To observe the color method, in order to differentiate with USB 2.0, the USB 3.0 Primoter Group recommended to use a blue base in the USB 3.0 interface, so we can distinguish from the color;

　　Watch the Touch method, this way more cautious, USB 2.0 only 4pin metal touch, and USB 3.0 is 9pin touch, the front 4pin and USB 2.0 is one, the rear 5pin is USB 3.0 exclusive.

As for USB 3.0 of the B-type interface is better to distinguish, USB 3.0 standard B-type interface size than USB 2.0 larger, the upper is more prominent, to accommodate the new 5pin contacts.

　　observe the labeling method, The USB 3.0 logo is shown below, and "SS" represents "SuperSpeed", which is available in the USB 3.0 interface section. In addition, USB 3.0 cables are slightly thicker than USB 2.0 cables because of the added route.