USB 2.0 VS USB3.0

USB 2.0

Speed High Speed 

Polling mechanism i.e will either send or receive knowledge (Half duplex)

Grey in color

USB 3.0

10 times quicker than USB two.0. 

Asynchronous mechanism i.e. will send and receive information at the same time (Full duplex)
For an analogous product, the USB 3.0 version is usually costlier than its USB two.0 version.

Blue in colorUSB 3.0

(SuperSpeed USB)

USB 3.0 is that the third major version of the Universal Serial Bus (USB) commonplace for laptop property. Among alternative enhancements, USB 3.0 adds a brand new transfer mode referred to as "SuperSpeed" (SS), capable of transferring knowledge at up to five Gbits/s (625 MB/s), that is quite 10 times as quick because the 480 Mbit/s (60 MB/s) high speed of USB a pair of.0. Besides completely different connectors used on USB three.0 cables, they'readditionally distinguishable from their a pair of.0 counterparts by either the blue color of the ports or the SS initials on the plugs.

A successor commonplace named USB three.1 was free in July 2013, providing transfer rates up to ten Gbits/s (1.25 GB/s, referred to as "SuperSpeed+"), that effectively place it on par with the primary version of Thunderbolt.

USB 2.0 (High-Speed USB 2.0)

In 2002, a more moderen specification USB a pair of.0, additionally known as Hi-Speed USB a pair of.0, was introduced. It inflated the info transfer rate for laptop to USB device to 480 Mbps, that is forty times quicker than the USB one.1 specification. With the inflated information measure, high outturn peripherals like digital cameras, CD burners, and electronic equipment may currently be connected with USB. It additionally allowed for multiple high-speed devices to run at the same time. Another necessary feature of USB a pair of.0 is that it supports Windows XP through Windows update.

Power consumption and capacity

USB 3.0 has been designed to scale back power consumption whereas increasing its capability to support and deliver a lot of power. The introduction of USB Battery Charging one.2 specification permits up to seven.5W of power to be provided to USB three.0 devices. USB 3.0 conjointly offers Associate in Nursing improved mechanism for getting into and exiting low-power states, betting on whether or not a tool is active or not, and eliminates power-consuming polling.

Cable length: USB 3.0 vs USB 2.0

The standard most cable's length is five meters for USB two.0 devices. The USB 3.0 customary doesn't specify a regular length; the utmost distance presently supported in USB three.0 is three meters.