The USB interface has become the most commonly used interface due to its excellent hot swapping performance and fast file transfer capability. However, with the gradual increase in disk capacity and the widespread use of large capacity files such as high-definition movies, the bandwidth of 480Mbps on the USB2.0 interface is no longer sufficient to meet users' needs for copying files. At this time, the USB3.0 interface emerged.

The theoretical bandwidth of the USB3.0 interface has been increased to 5Gbps. In actual use, Yangzai copies a 40GB capacity 1080P "Avatar" movie in less than 10 minutes, and the transfer speed fluctuates around 70MB/s per second, significantly improving the file transfer speed compared to USB2.0. There is no doubt that the USB3.0 Portable storage device is a must for HD users. The transmission speed can also compete with USB3.0 with the E-SATA interface, but due to the need for auxiliary power supply, the utilization rate of the E-SATA interface is far lower than that of the USB interface.

The theoretical speed of USB2.0 is 480Mbps per second (approximately 60MB per second), but no USB2.0 device can reach this theoretical maximum speed limit. In practical applications, achieving an average speed of 320Mbps (approximately 40MB per second) is already quite impressive. In fact, the transmission speed of the USB2.0 motherboard is generally around 20MB to 30MB.

Similarly, the theoretical speed of USB3.0 can reach 5Gbps per second, approximately 625MB per second (please note that the case of b and B is different). But in fact, some motherboards that support USB3.0 have actually reached a transmission speed of 150MB per second, which is nearly five times faster than USB2.0.

What is the fastest transmission speed of USB 3.0?

1. If it's interface speed: Actually, 400MB/S

2. If it is Portable storage device speed: at this stage, the device actually writes about 110M/S and reads 130M/S

Example question: Why is the USB3.0 transmission speed extremely slow?

Q: I bought a Portable storage device that is USB3.0. I added a card to my laptop that extends USB3.0. It is a chip like FL1000. After installing the driver, I tried it. The write speed of transferred files was only about 30M per second. Previously, the speed of USB2.0 was about 18M. What is the reason? Is this related to computer configuration? I think USB 3.0 should achieve a transmission speed of around 80M in any case?

Answer: In theory, USB2.0 can also achieve a transmission speed of 60M/S.

In theory, USB3.0 can also achieve a transmission speed of 628MB/s.

In fact, USB2.0 is enough. USB3.0 is mainly used for Solid-state drive and other products with high transmission speed, so there will be no bottleneck.

USB 3.0 is mainly limited by your hard drive transfer speed on your computer! My 1T hard drive has an average read speed of only 70M/S and a write speed of only 50M/S. Laptop hard drives generally have lower speeds than desktop ones, and your write speed of 30M is considered normal.

The speed of your hard disk can't reach 80M, no matter what kind of interface you use~~~Unless you use Solid-state drive, of course, your Portable storage device must also be a Solid-state drive, which can easily achieve a transmission speed of more than 100M+.