I think the problem is with the port? Because, there should be no issues in connecting a USB 2.0 onto a USB 1.1 device, other than limitation of speed, as far as I know.
Did you try connecting other devices on his USB 1.1??
In that case, I can only suggest you look back at the hardisk if it specifies, USB(1.0/2.0)... Personally, I couldn't think of any problem other than the hardisk's capability itself.
Does it detect at least the hardisk, show any error?
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