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And they have to supply that power before anything is plugged in, since the device needs to power up to talk to the host to tell how much power it really needs.

When you initially plug something in, a USB device can only draw a maximum of 100mA without telling the host that it wants more. Unless the USB enclosure only needs 100mA on the second plug, it will violate the USB specification.


Ack. A clear violation, then. Good thing the laptop makers know about it and provide for it these days!

Cheers