usb2.0 refers to Universal Serial Bus2.0, which is a new interface technology used in the computer field. The USB interface has the characteristics of faster transmission speed, support for hot swapping and connection of multiple devices. There are four (five) types of USB interfaces: USB1.1, USB2.0, USB3.0 and USB3.1 (3.1Gen 1 and 3.1Gen 2); in theory, the transmission speed of USB1.1 can reach 12Mbps, while USB2.0 It can reach speeds of 480Mbps.
The operating environment of this article: Windows 7 system, Dell G3 computer.
USB (Universal Serial Bus2.0, Universal Serial Bus) is a new interface technology used in the computer field. The USB interface has the characteristics of faster transmission speed, support for hot swapping and connection of multiple devices. It has been widely used in various types of external equipment. There are four (five) types of USB interfaces: USB1.1, USB2.0, USB3.0 and USB3.1 (3.1Gen 1 and 3.1Gen 2).
Theoretically, the transmission speed of USB1.1 can reach 12Mbps, while USB2.0 can reach a speed of 480Mbps, and is backward compatible with USB1.1. As early as 1995, there were already personal computers with USB interfaces, but due to the lack of software and hardware device support, the USB interfaces of these personal computers were idle and unused.
After 1998, with Microsoft’s built-in support module for the USB interface in Windows 98, and the increasing number of USB devices, the USB interface gradually entered the practical stage. In recent years, with the popularity of a large number of personal computers that support USB, USB has gradually become a standard interface for personal computers. On the host side, almost 100% of the latest personal computers support USB; on the peripheral side, an increasing number of devices use USB interfaces, such as digital cameras, scanners, joysticks, tape and floppy drives, imaging devices, printers, keyboards, and mice. etc.
Advantages
Can be hot-swapped
This allows users to use external devices without having to repeat the action of "turn off the computer, connect the parallel port or serial port cable and then turn it on again". Instead, users can directly plug in the USB cable and use it while the computer is working.
Easy to carry
USB devices are mostly known for being "small, light and thin".
Unification of standards
Before the introduction of the USB interface, the most common ones were hard drives with IDE interfaces, mouse and keyboard with serial ports, and printer scanning with parallel ports. However, with USB, these application peripherals can all be connected to personal computers using the same standards. At this time, there are USB hard drives, USB mice, USB printers, etc.
Can connect multiple devices
USB often has multiple interfaces on personal computers and can connect several devices at the same time. If connected A USB HUB with four ports can connect four more USB devices. By analogy, continue connecting as much as possible, and connect all your home devices to a personal computer at the same time without any problems (note: up to 127 devices can be connected).
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