usb 3.0 and  usb 2.0

usb3.0 transfer rate is ten times USB 2.0, USB 2.0 at a rate of 480 Mbps, while USB 3.0 can reach 4.8 Gbps. Of course, many devices do not need such a high rate, but hard drives and card readers and other equipment requirements for speed or high. Compared with USB 2.0, USB 3.0 will be more energy efficient. In addition, USB 3.0 is backward compatible, support USB 2.0 devices.

USB 3.0 is compatible with a standard, supports common I / O interfaces, and will be optimized to reduce energy consumption, while improving the efficiency of the computer protocol, consumer goods and products in the field of mobile products that support the ability to move fast synchronization that supports both optical and digital component specifications, and with the ease of use and plug and play features traditional USB technology.

Mini USB 3.0 has an interface will be divided into A, B two public ports, while female port will have B and AB are two, from the shape point of view, AB female port compatible A and B are two public ports, at the same time you can see, Version 3.0 is a male 9-pin port pins, while 2.0 is a 5-pin.

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 For backwards compatibility version 2.0, USB 3.0 uses a 9-pin design, four pins and USB 2.0 shape definitions are identical, while the other five are designed for USB 3.0 ready
Observe the color of law, in order to draw a distinction with USB 2.0, USB 3.0 Primoter Group recommended the industry with blue base in USB 3.0 interface, so we can be distinguished from the color;

Observation contact plate method, USB 2.0 only with 4pin metal contacts, and USB 3.0, compared with 9pin contacts, front 4pin with USB 2.0 is one to the rear of 5pin USB 3.0 was exclusive.

USB B Interface 3.0, USB 3.0 standard type B USB 2.0 port size larger than, the upper part of the more prominent, 5pin accommodate new contacts.
Observation Labeling Act, “SS” stands for “SuperSpeed”, the USB 3.0 interface section will have the logo. In addition, USB 3.0 cable due to the increased route, hence thicker than the USB 2.0 cable.

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