Quote:
Originally Posted by HarryT
Presumably the reason is that it requires more power to properly charge than the USB standard permits, and Mac USB ports can supply that, whereas a "normal" USB port can't.
If I recall correctly, the USB standard permits a port to supply up to 5W of power (5V at 1Amp); the iPad charger supplies 10W.
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Yes, the later model Mac USB ports are adaptable-they can supply more power if needed.
http://support.apple.com/kb/HT4049?viewlocale=en_US