The Universal Serial Bus is a standard for connecting your computer and laptops to other electronic devices. It is the primary component that helps you in attaching your PC to an external hard drive or pen drive and transfer data. It has been around for a while with the first significant release of USB as 2.0 in the year 2000 while the second remarkable version was USB 3.0 which came on the market in 2008. There are a lot of things which make usb 3.0 speed better than its previous model.
USB 2.0 was released back in April 2000. It was, at that time, known as the High Speed or HS device and offered a 480 megabits per second speed for transferring data. The devices were working in the half-duplex mode. It suggests that it can either send data or receive data. One was not able to engage both devices in sending and receiving with the help of this model. The power usage for USB 2.0 is around 500 mA. It has 4 wires within the cable with both Standard A and Standard B connectors. You can differentiate them as the A connectors are grey in color while B connectors are smaller in size. The maximum length of wire for USB 2.0 can be 5 meters.
On the other side, we have USB 3.0, which is the successor to 2.0. It was released back in November 2008 and is said to be 10 times faster than the previous version. The inclusion of SuperSpeed or SS technology has taken its transfer rate up to 4.8 Gigabits per second. Moreover, the power usage of this model is up to 900 mA, but the pundits also suggest that it is more power efficient. For instance, the power consumption in idle state is just a little, and also it can supply power to several devices from a single hub. The number of wires within this cable are 9, which is more than twice considering 2.0, and allow for complete duplex functionality. It means that the signaling method is asynchronous and can send data as well as receive data at the same time. For its identification, you can consider taking a look at Standard-A connectors which are blue in color while the B connectors will have some space for a few more wires. The maximum cable length for this type of USB is 3 meters only.
So, these are the differences between USB 3.0 and USB 2.0. One thing is for sure that USB 3.0 speed is undoubtedly better than the previous model. Moreover, there have been more advancements made in the technology, and you even have USB 3.1 Gen 1 and USB 3.1 Gen 2 available in the market. Moreover, the higher power, more bandwidth, and better utilization of buses ensure that you get the best data transfer possible. Also, it is backward compatible and can be used with the products that are manufactured with 2.0 standards.