I want to know the answer to the following question:
What does USB compliance specification prohibit?
All the background I'm provided with is that "Some devices, such as high-speed external disk drives, require more than 500 mA of current and therefore may have power issues if powered from just one USB 2.0 port: erratic function, failure to function, or overloading/damaging the port.". Is that enough to answer the question?