The full name of USB is universal serial bus, which can connect 127 peripherals at most. Due to its advantages of hot plug and plug-and-play, USB interface has become the standard interface for scanners. There are two specifications of USB, USB 1. 1 and USB2.0.
USB 1. 1 is a universal USB specification at present, and its transmission rate is 12Mbps in high-speed mode and 1.5Mbps in low-speed mode. Note: B here stands for bit, 1MB/s (megabyte/second) =8MBPS (megabit/second),12mbps =1.5mb/s. At present, low-end home scanners are mainly of USB interface type.
The USB2.0 specification is developed from the USB 1. 1 specification. Its transmission rate reaches 480Mbps, which is 60MB/s when converted into MB, which is enough to meet the speed requirements of most peripherals. The Enhanced Host Controller Interface (EHCI) in USB 2.0 defines the architecture compatible with USB 1. 1. You can use USB 2.0 driver to drive USB 1. 1 devices. That is to say, all devices that support USB 1. 1 can be directly used on the interface of USB 2.0, without worrying about compatibility issues, and accessories such as USB cables and plugs can also be directly used.
At present, all hosts have USB interfaces, so the application of USB optical storage is extremely convenient. As the interface of external optical storage equipment, the application is quite flexible, and there is no need to add additional equipment for the interface, thus reducing investment.