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2.0 is the version number of the USB.

You have several USB versions:

1.0 - Speed of 1.5 Mbps or 12 Mbps had problems and barely made it to the market

1.1 - Speed of 12 Mbps

2.0 - Speed of 480 Mbps

3.0 - Speed of 3.2Gbps (3200 Mbps), it is new and not yet available on the market

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Q: What does 2.0 in a USB mean?
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