Why is my wd passport not recognised on any device i plug it into

when plugging my wd passport in it keeps coming up as usb device not recognised. PLEASE HELP!!!!!
2 answers Last reply
More about passport recognised device plug into
  1. Does it require a extra AC power source? if so, use that and it should work
  2. If it is new, try this:

    Right click My Computer, select Manage. Expand Storage and select disk management. Select your storage device and format.
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