Is USB 3.0 faster than USB 2.0?
USB 2.0 provides ample bandwidth for a wide variety of devices and applications, but with the advent of high-definition video, terabytes (1000GB) storage devices, up to gigabit digital cameras, high-capacity mobile phones, and portable media players, higher bandwidth and transfer speeds are a must. A transfer speed of 480Mb/s may not be fast, not to mention that no USB 2.0 device - Dongguan USB cable manufacturer can reach this theoretical maximum speed limit. In practice, it is good to be able to reach an average speed of 320Mb per second. Similarly, in fact, USB 3.0 also does not reach the theoretical value of 4.8Gb, but even if it can only reach 50% of the theoretical value, it is close to 10 times that of USB 2.0. How did USB 3.0 do it so fast? The reason why USB 3.0 has "overdrive" performance is entirely due to the improvement of technology.
Compared to the current USB 2.0 interface, USB 3.0 adds more parallel mode physical buses. Reader friends can pick up a USB cable next to you and look at the interface part. On the basis of the original 4-wire structure (power, ground, 2 pairs of data), USB 3.0 adds 4 more lines for receiving and transmitting signals. Therefore, whether it is in the cable or on the interface, there are a total of 8 lines. It is the additional 4 (2 pairs) of lines that provide the bandwidth required by the "SuperSpeed USB" to achieve "overspeed". Obviously 2 (1 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 bidirectional data transfer mode instead of the half-duplex mode of the USB 2.0 era. Simply put, data only needs to flow in one direction, simplifying the time consumption caused by waiting. In fact, USB 3.0 does not take any advanced technology that we rarely hear of, but theoretically increases the bandwidth by 10 times. Therefore, it is more friendly and friendly, and once SuperSpeed USB products come out, it can be easily accepted by more people and make better customized products.
