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I have a Dell Precision T3400 on Windows Xp Pro Sp3 and whenever i connect an external Hard drive, it dies after a few seconds. However the drive works fine in other computers. How can I debug USB power issues?

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Does the external hard drive die or does the computer die? Does the external hard drive get its power from the USB or does it get its power from a power brick? –  James T May 31 '10 at 8:10
    
the drive dies...its powered from the USB –  iceman Jun 1 '10 at 23:18

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It's not going to be easy, but you could strip your USB cable and put one of the wires through an amp clamp meter to see the draw. You could also plug in a powered hub into the computer to see if that makes a difference.

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