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iPad Charging
Authored by: Superboy on Feb 04, '11 05:35:29PM

iPads will charge slowly when attached to a normal "full power" USB socket, such as those found on most PCs and pre-2009 Macs, as long as its display is off. Almost all Macs from 2007 and beyond will charge an iPad relatively quickly, as they have what's known as a "high power" USB sockets. Most Macs from 2007 to present can supply one high power socket. However, some portables have two high power sockets, and the Mac mini can supply three high power USB devices, along with the 27" Apple LED Display. The high power sockets on the LED Display also work if the host Mac has no high power sockets itself. The same goes for iPhones too, they will charge much more quickly when attached to a high power USB socket.

If you go to the USB section in System Profiler, high power devices attached to a high power socket will display "Extra Operating Current (mA): 500". High power sockets can supply 5.5 watts, normal sockets can supply 2.5 watts. The iPad wall charger can supply 10 watts, making it the best one to use if you're in a rush. It's a shame Apple didn't keep Firewire, even if it was only for charging. Firewire can supply up to 60 watts!

Edited on Feb 04, '11 05:55:41PM by Superboy

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