How to monitor USB power consumption?

I'm looking for a way to monitor the power being drawn from the USB ports on my Mac.

System Profiler doesn't appear to display this and I haven't been able to find any applications or tools to do the job either.

Can anyone suggest anything (preferably software based)?

Solution 1:

USB power consumption information should be available in System Profiler. See the screenshot below:

Solution 2:

There is an application that is part of the Developer Tools on your Mac called USB Prober. It should provide you with the details that you need.

It can be found by signing up (free) for a Mac Developer Account and downloading the latest Xcode tools at http://developer.apple.com/technologies/tools/.

After installation the application you are looking for is found in /Developer/Applications/Utilities.

Hope that helps.