external usb drive voltage issue

Discussion in 'MacBook Pro' started by bigmac2011, Jul 31, 2011.

  1. bigmac2011 macrumors newbie

    Jul 12, 2011
    Hi I have an external usb drive. It`s a cheap Akasa Integral usb case with a seagate drive in it. I have two

    When I connect the drive to my macbook pro and touching the macbook case i feel a vibration. When I pull the usb plug out It dissapers.

    When I test the usb plug with a voltage screwdriver light bulb tester the bulb lights up.

    Is this normal? Or is it some kind of leakage from the power supply from the usb external drive case.

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