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I see that the latest 13 inch MacBook Air has two USB 2.0 ports, but can they power, say, a 2.5 inch external hard drive?

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up vote 4 down vote accepted

Yes, the USB ports are powered. In fact, they are designed to power the USB SuperDrive, which draws more power than most USB ports support.

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Good to know, thank you! –  hpy Jan 13 '11 at 16:10
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