Everyone usually thinks that USB interfaces are divided into two categories - USB 1.1 and USB 2.0. The biggest difference between the two is the transmission rate: the maximum theoretical data transfer rate of USB 1.1 is 12Mbps, and USB 2.0 is 40 times that, reaching 480Mbps. In fact, this understanding is not entirely accurate today. You can read below for a picture introduction of USB3.0 interface types.
USB 3.0 interface introduction and types
The USB 3.0 Promoter Group, composed of industry giants such as Intel, Microsoft, HP, Texas Instruments, NEC, ST-NXP and other industry giants, announced on 2008-11-18 that the USB 3.0 standard interface and cable samples developed by the organization have been made public. The specification provides ten times the transfer speed and higher energy efficiency of USB 2.0, and can be widely used in PC peripherals and consumer electronics.
The first version of USB 1.0 appeared in 1996, with a speed of only 1.5Mbps; two years later, it was upgraded to USB 1.1, and the speed was greatly increased to 12Mbps. This standard interface can still be seen on some old devices; in April 2000, the currently widely used USB 2.0 was launched, with a speed of 480Mbps, which is forty times that of USB 1.1; now eight and a half years have passed, and USB The speed of 2.0 has long been unable to meet application needs, so USB 3.0 emerged as the times require. The maximum transmission bandwidth is as high as 5.0Gbps, which is 625MB/s. It is also backward compatible when using the Type A interface.
USB 3.0 will be called "USB SuperSpeed" in actual device applications, following the previous USB 1.1 FullSpeed and USB 2.0 HighSpeed.
The USB3.0 interface has the following shapes:
USB 3.0 symbol identifies USB SuperSpeed
USB 3.0 interfaces are all blue, the most common Standard-A male interface
A currently common USB 3.0 interface is mostly used on 3.5-inch mobile hard drives.
USB 3.0 Micro-B type interface
USB 3.0 Micro-B type interface
It can be used as a universal socket with ordinary mini USB 2.0 interface.
In addition to the speed advantage, the USB 3.0 interface has other advantages. USB 3.0 can provide 50% to 80% more power to support devices that require more power to drive, and devices that are charged through USB indicate that charging can be completed faster.
In addition, in terms of power saving: a large amount of data stream transmission requires faster performance support. During simultaneous transmission, the device can transition to a low-power state when idle. You can even be free to receive other instructions and complete other actions.
In the era of vigorous development of computer hardware, it is inevitable for the USB3.0 interface to surpass the 2.0 interface in transmission speed. At least for efficient computer hardware, it consumes more power and can even be ignored.