Why do I get sparks from my usb connector when connecting it to my Mac

Posted by david.sykes on Super User See other posts from Super User or by david.sykes
Published on 2010-06-03T10:50:08Z Indexed on 2010/06/03 10:56 UTC
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I have an external hard drive with its own power. When I touch the usb cable against the case of my Mac I get little sparks. I have tried it on a PC but don't seem to get the same sparks

Why might this be?

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