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External HDD Suddenly Not Working

I have a WD Passport that was working perfectly fine. I safely removed it from my laptop (Windows 7 Home Premium 64 Bit) and put it on my friend's laptop (don't know the specs), and it read just fine. I safely removed it and suddenly my laptop won't read it. It appears in the Device and Printers section with an exclamation mark.

I uninstalled the driver and reconnected it and it won't install the driver. I uninstalled ALL drivers under the Device Manager that had to do with the USB, then reboot. Everything installed perfectly except the one for the external HDD.

I read somewhere about assigning a letter to it in the Disk Management, but it just doesn't appear, at all.

Help?
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  1. Best answer
    Try "Data Lifeguard Diagnostic for Windows" first, then look at the Knowledge Base. If the computer still can't recognize it, contact the WD. http://wdc.custhelp.com/app/answers/detail/a_id/8/session/L2F2LzEvdGltZS8xMzgxMjcwNDgzL3NpZC80eENONGpDbA%3D%3D

    Data Lifeguard Diagnostic for Windows: http://support.wdc.com/product/download.asp?groupid=810&sid=3&lang=en
    Knowledge Base: http://wdc.custhelp.com/app/answers/detail/a_id/1708/session/L3RpbWUvMTM4MTI3MDQ2Ni9zaWQvNHhDTjRqQ2w%3D
  2. cin19 said:
    Try "Data Lifeguard Diagnostic for Windows" first, then look at the Knowledge Base. If the computer still can't recognize it, contact the WD. http://wdc.custhelp.com/app/answers/detail/a_id/8/session/L2F2LzEvdGltZS8xMzgxMjcwNDgzL3NpZC80eENONGpDbA%3D%3D

    Data Lifeguard Diagnostic for Windows: http://support.wdc.com/product/download.asp?groupid=810&sid=3&lang=en
    Knowledge Base: http://wdc.custhelp.com/app/answers/detail/a_id/1708/session/L3RpbWUvMTM4MTI3MDQ2Ni9zaWQvNHhDTjRqQ2w%3D


    It doesn't even show up in the list of the Data Lifeguard thing-

    Edit-
    It got to the point where it randomly recognizes it as an F: but when I click it it starts loading up and then nothing, Windows stops responding and it never opens it to see the files x.x I had a lot of college work in it, ugh!


    It Says Code 10?
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