Just read this article for USB 2.0 vs USB 3.0 comparison. You may know the Difference between USB 2.0 and 3.0 before you buy USB.
USB 3.0 offer high efficiency power management and superior speeds compared to the currently more common USB 2.0. USB 3.0 ports are backward compatible.
However, when USB 3.0 device is connected to USB 2.0 port, the data transfer speed will be limited to USB 2.0 levels. USB stands Universal Serial Bus.It is a most popular and advanced interfacing device is used to connect up to 127 peripherals to the computer. In future more and more devices are made with USB configuration.
There are 7 ways show you different between the USB 2.0 and USB 3.0
1. Port Differences:
The USB ports for USB 2.0 and USB 3.0 also differ visually. Figure 1 illustrates the visual difference between the two types of USB ports:
USB 2.0 has a black “block” inside the USB port.
Conversely, USB 3.0 has a blue “block” inside the USB port.
The more recent USB 3.1 port also differs visually in that the block inside the USB 3.1 port is red in color.
2. Data Transfer Rate:
- USB 2.0 has a data transfer rate of 480 megabits per second (mbps).
- USB 3.0 has a data transfer rate of 4,800 mbps. This means that a USB 3.0 is approximately 10 times faster than USB 2.0.
More recently, a USB 3.1 has also been released. A USB 3.1 has a data transfer rate of 10,000 mbps. This is twice as fast as USB 3.0 and twenty times as fast as a USB 2.0.
| USB 2.O | USB 3.0 | Speed Difference | |
| Read Speed | 480 mbp/s | 4800 mbp/s | +1000% |
| Write Speed | 30 MB/s | 80 MB/s | +266% |
3. USB 2.0 vs 3.0: Power
USB 3.0 ports deliver 4.5-7 watts of power with 900 mA of current,which is slightly two times more than USB 2.0 is deliver 2.5 watts power with 500 mA current.
- USB 3.0 has high power ratings, so it can easy to interface with high power rated devices and future hardware.
A USB 2.0 port is able to deliver 0.5 A of power while USB 3.0 is able to output 0.9 A. This means two things: USB 3.0 devices are able to charge faster and USB 3.0 ports can support more power-hungry devices.
| USB 2.O | USB 3.0 | Speed Difference | |
| Power | 500 mA | 900 mA | +180% |
We first connected our Note 3 to a desktop computer’s USB 2.0 port and recorded the time it took for the phone battery to charge from 0 to 100%. The same process was then repeated with a USB 3.0 port and a wall charger.
4. Data transferring method
USB 3.0 uses full-duplex method,so it can transfer and receives data simultaneously between two devices.But USB 2.0 uses half duplex method and has no capable to transfer and receive data simultaneously. USB 3.0 uses full-duplex method,so it is faster than the half duplex method in USB 2.0.
5. Price
Price is still a huge factor here. Even USB 3.0 devices are more expensive than compare to USB 2.0 devices. But present days prices of USB 3.0 is greatly reduced than compare with earlier days and day-to-day cost of USB 3.0 is reducing due to manufacturing techniques.
Many USB 2.0 flash drives are super cheap — for example, you can pick up an 8 GB USB 2.0 flash drive for under $10 on Amazon. 4 GB flash drives can often be found on sale for $5. In comparison, USB 3.0 drives are more expensive. The fastest USB 3.0 drives will also be the most expensive ones. You may have to shell out $40 or more to see a really significant speed improvement
