When i connect my external hard drive my pen drive doesnt get connected

When i connect my WD 1 TB hard disk my pendrive doesn't gets detected....
Can anyone help pls...
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More about when connect external hard drive drive doesnt connected
  1. It's probably because there's not enough power at the USB ports to drive both devices at the same time, in which case you need to buy a "mains-powered USB hub" like this:
    http://www.amazon.co.uk/Port-Mains-Power-Supply-Cable/dp/B002LPVO66
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