Satellite A500-1GM electric circuit touching touchpad and USB case

It's intermittent, but I seem to be able to create a current through my fingers from the two buttons at the front of the touchpad.
Current plug configuration is like this:
- 4 way splitter, including plugged in laptop and plugged in external hard drive
- IF the hard drive is plugged in but NOT connected to laptop with the USB cable, touching the touchpad buttons and the metal casing of the external hard drive creates a circuit.
- This circuit can be bypassed by connecting the USB cable to the laptop.
- This circuit can be recreated by unplgging the laptop from the mains.
The sensation of the electric circuit is a buzzing tingling through my fingertips at the point of contact with the touchpad buttons.
By running my fingers along the buttons, the circuit can be felt stronger.
Why does this occur? How are the touchpad buttons connected to the power source?
How can I get this repaired?
T.Smith

Hi
I think this happens because of earthing.
[Wikipedia Ground (electricity)|http://en.wikipedia.org/wiki/Ground_(electricity)]
If the external HDD is not connected to the notebook via USB cable then there is no conduction and grounding. The same happens when the AC adaptor would be disconnected.
I think the insulation of your HDD is not good and I would recommend contacting the dealer or the HDD support team.

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