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I have a MacBook Pro with both Mac OS X Lion and Windows (under BootCamp) installed. While in Windows, I tried to charge my iPad 3 via the USB port. The iPad says "Not charging", but really, it does, just super slow (4-5% per hour). The reason for this is that the iPad requires 2.1 A of current, but a standard USB port provides 0.5 A.
However, if I switch to Mac OS X, the iPad states that it is charging and it does at a rate of about 10% per hour.
The only takeaway from this is that either OS X puts out more current on the USB port or that it recognizes the iPad and acts accordingly.
Can someone provide more information on what is actually happening?
Yep. This is exactly what I was looking for. – AngryHacker – 2012-04-18T19:00:22.793