How much power is required from a USB port?

The 3rd gen Nano manual says that a "high-power USB port" is required (e.g., a un-powered USB hub won't work). If I buy a USB2 cardbus adapter (because my old laptop only has a USB 1 or 1.1 port), how much power is "high-power"?
D-Link sells such an adapter (DUB-C2) that says it has 500 ma per port. Is that enough power to charge Nano?

100mAmps is low power.
500mAmps is high power.

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