Difference between USB 2.0 and USB 3.0

I don’t know how many of you know about this gentleman “Ajay Bhatt” this Man is behind the Discovery of “USB”. The project of making “Universal Serial Bus” started in 1994. In which 7 companies joined hands together and did this work and the leader of this project was “Ajay Bhatt”.He was an Indian – American computer scientist 

The name of these seven companies are Compaq, IBM, DEC, Intel, Microsoft, NEC, and Nortel 

“Ajay Bhatt” and his team invented USB 1.0 in 1996

Since 1996, USB’s journey started, since then there has been a lot of development in this field, whether in terms of speed or space. From there the USB 2.0 and USB 3.0 will start making it

Now let’s talk about why we need that “USB”

1-short distance data communication

2-digital data transfer from one device to other

3-it can also supply electric power to the device

Why do we need to upgrade?

1-Better speed in data transfer

2-Fast Charging

3-Quick data service

Now let’s talk about “USB 2.0” and “USB 3.0”

“USB 2.0” was Introduced in 2000 and 3.0 was introduced 8 years later in 2008.


“USB 2.0”

“USB 3.0”

Introduced year



Number of wire inside the cable




480 Mbps (megabits per second)

4.8Gbps (Gigabits per second)


For a  product, price is less in compare to 3.0 USB

For a similar product, price is more in compare to 2.0 USB

Signaling Method

Polling mechanism (it can either send data or receive data)

Asynchronous Mechanism(can send data and receive data simultaneously)

Max Cable length

1 to 5 meter

0.50 to 3 meter

Power usage

Up to 500 mA

Up to 900mA

Standard A Connectors colors



Standard B Connectors

Small in size

Having lots of space for other wires

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*Benefits of 3.0 over USB 2.0

1- 10 times faster than USB 2.0(480mbps <<<<<<<<<< 4.8Gbps)

2-USB 3.0 provides more power (up to 500mA<up to 900mA)

3-It has more bandwidth and it can also send and receive data simultaneously, which 2.0 does not support

4-It also improve Bus utilization by A new feature was added (using packets NRDY and ERDY) to let a device asynchronously notify the host of its readiness. ]

*Physical features of all USB

  • The world is progressing a lot, at that time we used to be happy with this speed, but the generation ahead of us is not happy with this speed and slow transferring data, maybe after some time we can see the speed of 100gb/s there is nothing surprising in this

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