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This article mainly introduces the theory of usb3.0 interface, what is the fastest transmission rate per second, which has a certain reference value. Interested friends can refer to it. I hope you will learn a lot after reading this article. Let's take a look at it.

The theoretical fastest transmission rate of usb3.0 interface is 5.0Gbps/ second (500MB/s). The reason why USB3.0 has the performance of "overspeed" is entirely due to the improvement of technology; compared with USB2.0 interface, USB3.0 adds more parallel mode physical bus and adopts two-way data transmission mode.

The operating environment of this tutorial: windows7 system, Dell G3 computer.

USB 3.0 is the latest USB specification, which is mainly initiated by industry giants such as Intel, Microsoft, Hewlett-Packard, Texas Instruments, NEC, ST-NXP and so on. The transmission rate is very fast, which can reach 5.0Gbps/ seconds (500MB/s) in theory, which is 10 times faster than the current 480Mbps High Speed USB (referred to as USB 2.0). The shape is basically the same as the current USB interface, and is compatible with USB 2.0 and USB 1.1 devices.

Description:

The reason for the "speeding" performance of USB 3.0 is entirely due to technological improvements.

Compared with the USB 2.0 interface, USB 3.0 adds more parallel mode physical buses.

You can pick up a USB cable around you and look at the interface section.

On the basis of the original 4-wire structure (power supply, ground wire, 2 data), USB 3.0 adds 4 lines to receive and transmit signals. So there are a total of 8 lines, both inside the cable and on the interface.

It is the addition of four (2 pairs) of lines that provide support for the bandwidth required by "SuperSpeed USB" to achieve "overspeed". Obviously, the two (one pair) lines on USB 2.0 are not enough.

In addition, the method of signal transmission is still controlled by the host, but it is changed to asynchronous transmission.

USB 3.0 takes advantage of the two-way data transfer mode instead of the half-duplex mode of the USB 2.0 era. Simply put, the data only needs to flow in one direction, simplifying the time consumption caused by waiting.

In fact, USB 3.0 has not adopted any advanced technology that is rarely heard of, but it has theoretically increased its bandwidth tenfold. As a result, it has more affinity and friendliness. Once SuperSpeed USB products are available, more people can easily accept them and make better customized products.

Comparison of Transmission Speed between USB3.0 and USB2.0

Test 1: read and write speed test

We connect to USB3.0 and USB2.0 interfaces respectively through the same mobile hard disk to test the reading speed of both. The data transmission speed is tested by writing and reading a certain amount of data, and each read and write is carried out 3 times and averaged.

USB3.0

We selected 16MB, 8MB, 4MB, 2MB and 1MB to record the data. We take 16MB as the reference standard, with an average write speed of 95.39MB/s and an average read speed of 97.67MB/s.

USB2.0

In the data speed test of USB2.0 interface, we can see that the average write speed of 16MB is 34.64MB/s and the average read speed is 33.07MB/s.

Test 2: copy file speed test

We choose five boxes, of which the RK3328 box is the USB3.0 interface, and the other four boxes are all USB2.0 ports.

By copying 1.1g test film, from the test interface, USB3.0 transmission speed is the fastest, but it is worth noting that although the other four boxes are USB2.0 interface, but the transmission speed is quite different, among which founder box F5 is the fastest, while Hymeidi H7 fourth-generation platinum version and Tmall M17 are slower.

Through the above two groups of actual test data, we can know that the reading and writing speed of USB3.0 is about 3 times that of USB2.0.

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