What's the difference between a computer's USB3.0 and a USB2.0?

What is USB?

USB, is the abbreviation of English Universal serial Bus (universal serial buses), and its Chinese Jane is called "Tong-line", is an external bus standard, which is used to standardize the connection and communication between computer and external equipment. is the interface technology applied in the PC field. The USB interface supports Plug and Play and hot-swappable features of the device. USB was presented by a consortium of companies such as Intel, Compaq, IBM and Microsoft at the end of 1994.
Next-generation USB interface will be changed direction, the next generation of Type-c USB interface, can support both sides plug, and transmission data signal strong, but currently (2014) manufacturers Limited

What's the difference between USB3.0 and USB2.0?

The new USB 3.0 provides the following enhancements while maintaining compatibility with USB 2.0:

Dramatically increased bandwidth-up to 5Gbps Full-duplex (USB2.0 is 480Mbps Half-duplex)
Achieve better power management
Can enable the host to provide more power for the device, so as to achieve usb-rechargeable batteries, LED lighting and mini fan applications.
Can make the host faster to identify the device
New protocol to make data processing more efficient
USB 3.0 can transmit bulk files (such as HD movies) at a storage rate that is limited by the memory components. For example, a USB 3.0 flash drive can transfer 1GB of data to one host in 3.3 seconds, while USB 2.0 takes 33 seconds.
Driven by increasing resolution and storage performance requirements for consumer electronics, the hope is that broadband Internet connectivity will enable wider media applications, so users need faster transfer performance to simplify downloading, storage, and sharing of multimedia content. USB 3.0 plays a crucial role in providing consumers with the ease of connectivity they need.
When used in consumer devices, USB 3.0 solves the problem that USB 2.0 does not recognize a battery-free device. The host can slow down the current via USB 3.0 to identify these devices, such as the cell phone that has been damaged by the battery.

Computers with USB3.0 interfaces have been out for many years, but USB3.0 devices, such as U disk, have not been widely popular because of the cost of USB3.0 equipment. Fortunately, USB3.0 interface, is backward-compatible, which means that if your computer is USB3.0 interface of the computer, you can normally use the USB2.0 u disk, but only the speed of USB2.0 transmission file data;

What is the main difference between USB2.0 and USB3.0? Actually very simple, can perceive the difference is two aspects, one is the price, the other is the transmission speed; the price is not much to talk about, because different equipment, price difference. Mainly talking about transmission speed;

USB2.0 's theory is that the highest transmission of data is 480M per second, while the USB3.0 theory has a maximum speed of up to 5G per second, so theoretically, USB3.0 's maximum transmission speed is more than 10 times times that of USB2.0. Of course, this is just the theoretical speed of the USB interface, but this speed is limited by other factors, for example, your U disk, although configured with USB3.0, but U disk inside the highest storage media write and read speed is far less than 5G per second, so sometimes the role of USB3.0 not to maximize the play out;

So how do you distinguish USB2.0 from USB3.0? Look at the picture, the USB3.0 is usually blue, the USB2.0 is usually black, and in general, each computer will have USB2.0 and USB3.0

Summarize

USB 3.0 is a newer version of USB, 10 times times faster than USB 2.0. If your computer is equipped with an older USB port, the USB 3.0 device is still available, but not as fast. To add a USB 3.0 port to your old computer, you can purchase and install a USB 3.0 adapter. For the fastest USB 3.0 device connection, be sure to use a cable and port with a USB 3.0 symbol, as shown below