MacBook Pro USB port provides more current in Mac OS X than in Windows

Posted by AngryHacker on Super User See other posts from Super User or by AngryHacker
Published on 2012-04-16T16:32:35Z Indexed on 2013/06/24 22:24 UTC
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Filed under:

osx

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usb

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macbook-pro

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iPad

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ipad-3

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?

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