Ø USB 3.0 is incompatible with USB 1.1
Ø USB 3.0 only supports a maximum cable length of 3 meters compared to 5 meters of USB 2.0
Ø Another major disadvantage of USB 3.0 is that mobile phones and other gadgets which will use the Micro-B USB 3.0 connector will have a width of 12.25mm while the Micro-B USB 2.0 Connector is only 6.86mm wide.
Ø Currently there are no OS available in the market which supports USB 3.0 and even the upcoming version of Windows i.e. Windows 7 will not support USB 3.0 though Microsoft may add support for it later on via Windows Update.
As you can see, currently USB 3.0 has more disadvantages than advantages but with time the disadvantages of USB 3.0 will reduce significantly which will help in making USB 3.0 mainstream.
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