I can see my external hard drive in device manager, but not in my comp

My passport external drive was working fine yesterday. I started to make an image of my PC and the storing the image on the passport. I forgot to turn off the sleep cycle and the pc shutdown. When I rebooted Windows it will not show my passport drive in My computer. When I connect the USB, windows makes the sound like it sees the drive but does not show up. I can see the drive in device manager. When I click on the drive in device manager it shows an I/O error. Is there an I/O shortage or is this error a false message. Please send your response to my email: rmatheson58@gmail.com
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More about external hard drive device manager comp
  1. Try the drive on another PC.
    If that also does not work, you can take out the drive from the case (if it's out of warranty), connect it directly to a PC, and see if that sees it.
  2. Go to disk manager and assign drive letter
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