My computer not detecting second hdd

i have two hdd in my computer. the first one has windows 7 and other hard disk kept as a storage. while my first hdd is working and not showing the second one. can you pls help?
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More about computer detecting
  1. is the second drive new? is it seen by your BIOS? have you checked in disk management?

    control panel/ admin tools / computer management / disk management
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