Do you have a computer? Or a laptop? Do you share resources with others? While you want to transfer your resources to other people's computer, how can you do that? Yes, you can download the resources to move it to somewhere else. And how can you download the resources? Connect the two machines? So you have to carry the computer with you at any time to avoid miss some good resource, right? What a trouble! Although there is laptops which is convenient to carry, it still exists some inconvenience. So, do you know a kind of device called USB, which is short for Universal Serial Bus?
What is USB? How does it works? When did it appear?Maybe you are using it in your daily life, but do you know clearly about it? I will tell you the answers.
The USB is a standard for peripheral devices. People produced it to make it easier for connecting external devices to personal computers (PC) by replacing the multitude of connectors at the back of PCs, addressing the usability issues of existing interfaces, and simplifying software configuration of all devices connected to USB, as well as supporting greater data rates for external devices. There are mainly three specifications of USB: 1.0, 2.0 and 3.0. The first widely used version of USB was 1.1, which was published in September, 1998. USB device communication is based on pipes. A pipe is a connection from the host controller to a logical entity. There are two types of pipes: stream and message pipes depending on the type of data transfer. When a USB device is first connected to a USB host, the USB device counting process is started. After reset, the USB device's information is read by the host and the device is assigned a unique 7-bit address. If the device is supported by the host, the device drivers needed for communicating with the device are loaded and the device is set to a configured state. No USB device can transfer any data without an explicit request from the host controller. USB makes connections to storage devices using a set of standards called the USB mass storage.
USB has one important advantage that it is possible to install and remove without rebooting the computer, which can be useful for mobile peripherals, including drives of various kinds. So you can use it at anytime, and no need to worry about using environments. It is very free to carry , and free to use. And it has all kinds of physical appearance, such as heart shaped, bear shaped, radio shaped and so on. Its color can also has many different types, white, red, blue, black, etc.
What kind of USB device do you want? Hard to decide it, right? You can find more details through visiting http://www.ecvv.com/.
About Author:
Customer service from www.ecvv.com, who is familiar with online promotions of SMEs. Who also can help to avoid online fraud, spam and cheat.
Resource:
www.ecvv.com is an innovative and comprehensive business portal in China, dedicated to saving costs for Chinese SMEs to find buyers and export to overseas markets.
<a href="http://www.ecvv.com">www.ecvv.com</a> is an innovative and comprehensive business portal in China, dedicated to saving costs for Chinese SMEs to find buyers and export to overseas markets.
Customer service from www.ecvv.com, who is familiar with online promotions of SMEs. Who also can help to avoid online fraud, spam and cheat.
Resource:
www.ecvv.com is an innovative and comprehensive business portal in China, dedicated to saving costs for Chinese SMEs to find buyers and export to overseas markets.
<a href="http://www.ecvv.com">www.ecvv.com</a> is an innovative and comprehensive business portal in China, dedicated to saving costs for Chinese SMEs to find buyers and export to overseas markets.
key words:
china USB.
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