What is the usb interface and what are the usb interfaces of the usb stick
The interface type refers to the interface specification used by the portable storage product to connect to the computer system. The current portable storage products basically use the USB interface to connect to the system, and its interface specification determines the speed of its transmission with the system. Among them, the USB1.1 interface can provide 12Mbps; the USB 2.0 interface can provide a data transfer rate of 480Mbps. But these are the maximum data transmission rates that can be achieved under the ideal state of the interface. In practical applications, due to some objective reasons (such as the main control chip used in the storage device, whether the production quality of the circuit board is good, etc.), it will be reduced. Slow the transfer rate in the application.
USB is the abbreviation of Universal Serial Bus in English, and the Chinese meaning is "Universal Serial Bus". It is not a new bus standard, but an interface technology applied in the PC field. USB was jointly proposed by Intel, Compaq, IBM, Microsoft and other companies at the end of 1994. However, it has not been widely used until recently. Since the release of the USB V0.7 version on November 11, 1994, the USB version has undergone years of development, and has now developed into the 2.0 version, which has become the standard extension interface in the current computer. At present, USB1.1 and USB2.0 are mainly used in the motherboard, and each USB version can be very compatible. The USB1.1 interface can provide 12Mbps; the USB 2.0 interface can provide a maximum transmission speed of 480Mbps. USB uses a 4-pin plug as a standard plug. It can connect all peripherals in a daisy chain form. Up to 127 external devices can be connected without loss of bandwidth.
The USB2.0 specification evolved from the USB1.1 specification. The original goal was to increase the transmission rate (12mbps) of USB1.1 by 10-20 times, but in fact it was increased by 40 times, reaching 480Mbps. The MB is 60MB/S. USB2.0 and USB1.1 are compatible with each other, that is to say, USB2.0 devices can work on the USB1.1 interface, and vice versa, USB1.1 devices can also work on the USB2.0 interface. Of course, the speed of the USB1.1 device will not be improved by installing on the USB2.0 interface, and the speed of the USB2.0 device installed on the USB1.1 interface will also be limited to 12Mbps (1.5MB/S) the following. The connecting cables and ports used by USB2.0 and USB1.1 are the same.
USB needs the support of the host hardware, operating system and peripherals to work. Moreover, the USB interface can also realize dual-machine interconnection through a special USB connection cable, and can expand more interfaces through the Hub. USB has the advantages of fast transmission speed, convenient use, support for hot plugging, flexible connection, independent power supply and so on.