External HD showing up in Device Manager but not in Device Management or Explorer

Hello, my Seagate Backup Plus 1.5TB Hard disk is not read by my system.( Win 7 64bit) Though the light appears on the hard disk, still it doesnt show up. The hard disk doesnt appear in any of the software tools viz Easus Recovery or Active partition recovery or the sea tools itself. Can you help me on this?
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More about external showing device manager device management explorer
  1. Does it show in disk management?
  2. spooky2th said:
    Does it show in disk management?

    No it doesn't.
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