The difference between usb 2.0 & usb 3.0

• USB 2.0 was released in April 2000, further development in USB technology led to USB 3.0 being released in November 2008.
• The biggest difference between USB 2.0 and 3.0 is the speed at which each can communicate with the computer’s host controller.
• USB 2.0 offers an approximate write speed of 3MB p/s and a read speed of 10MB. USB 3.0 offers an approximate write speed of
• 15.9MB p/s and a read speed of 36.3MB. This transfer speed depends on the device in use as well as the bus, port and cable type etc.
• 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 capability to transfer and receive data simultaneously. As USB 3.0 uses full-duplex method, it is faster than the half
• duplex method in USB 2.0.
• USB3.0 offers faster performance and improved power efficiency over USB2.0 while maintaining backward compatibility with USB 2.0
• interfaces i.e USB 3.0 ports and devices are backwards compatible with any USB devices and ports, but the data transfer speed is less.
• The USB3.0 interface will mainly benefit devices with extreme bandwidth requirements, for example those streaming high definition
• video etc.
• USB 3.0 devices are more expensive than compared to USB 2.0 devices. But present day prices of USB 3.0 are greatly reduced
• compared with earlier days cost of USB 3.0 due to manufacturing techniques.

• • USB 3.0 port shape and size is the same as USB 2.0 the only physical difference is that the plastic piece in the usb socket is blue in
  • USB 3.0 while USB 2.0 has black color and copper pins on plastic piece are 9 divided into two rows (first row has 4 pins and second
  • row has 5 pins) in USB 3.0 while USB 2.0 has 4 copper pins.
  To sum up, USB 2.0 is cheaper and runs slower vs. the more expensive and faster USB 3.0.

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