What is the theoretical fastest transfer rate of usb3.0 interface?

The theoretical fastest transmission rate of the usb3.0 interface is: 5.0Gbps/second (500MB/s). The reason why USB3.0 has "super speed" performance is entirely due to technological improvements; compared with the USB2.0 interface, USB3.0 adds more parallel mode physical buses and adopts a bidirectional data transmission mode.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

USB 3.0 is the latest USB specification. This specification is mainly initiated by industry giants such as Intel, Microsoft, HP, Texas Instruments, NEC, ST-NXP and other industry giants. It is characterized by a very fast transmission rate, which can theoretically reach 5.0Gbps. / second (500MB/s), which is 10 times faster than the current 480Mbps High Speed ​​USB (referred to as USB 2.0). The appearance is basically the same as the current USB interface, and it is compatible with USB 2.0 and USB 1.1 devices.

Note:

The reason why USB 3.0 has "super speed" performance 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 nearby and look at the interface part.

Based on the original 4-wire structure (power, ground, 2 data), USB 3.0 adds 4 more lines for receiving and transmitting signals. Therefore, there are a total of 8 lines, whether in the cable or on the interface.

It is the additional 4 (2 pairs) lines that provide the bandwidth required by "SuperSpeed ​​USB" to achieve "super speed". Obviously 2 (1 pair) lines on USB 2.0 are not enough.

In addition, the signal transmission method still uses host control, but it is changed to asynchronous transmission.

USB 3.0 utilizes a bidirectional data transmission mode, instead of the half-duplex mode of the USB 2.0 era. Simply put, data only needs to flow in one direction, which simplifies the time consumption caused by waiting.

In fact, USB 3.0 does not adopt any advanced technology that is rarely heard of, but it theoretically increases the bandwidth by 10 times. Therefore, it is more approachable and friendly. Once SuperSpeed ​​USB products come out, more people can easily accept them and make better customized products.

Comparison of USB3.0 and USB2.0 transmission speed

##Test 1: Reading and writing speed test

We connected the same mobile hard disk to the USB3.0 and USB2.0 interfaces respectively to test the reading speed of both. Test the data transmission speed by writing and reading a certain amount of data. Each reading and writing is performed three times and the average value is taken.

USB3.0

We selected 16MB, 8MB, 4MB, 2MB, and 1MB for data recording respectively. We use 16MB as the reference standard, the average write speed is 95.39MB/s, and the average read speed is 97.67MB/s.

USB2.0

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

Test 2: Copy file speed test

We selected 5 boxes, among which the RK3328 box is USB3.0 interface, the other four boxes are all USB2.0 interfaces.

By copying the 1.1G test video, USB3.0 has the fastest transmission speed from the test interface. However, it is worth noting that although the other four boxes all have USB2.0 interfaces, the transmission speeds are quite different. , among which Founder Box F5 is the fastest, while Haimedi H7 Fourth Generation Platinum Edition and Tmall M17 are slower.

Through the above two sets of actual test data, we can see that the reading and writing speeds of USB3.0 are about 3 times that of USB2.0.

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