Problem with my external hard drive

Hello all,
I have an external hard drive when I connect it to the computer I hear the sound of connection I also can see that it is recognized at drivers "My Passport Ultra"
upload_2017-3-27_20-14-8.png

but It is not recognized in the disk management
upload_2017-3-27_20-15-40.png

and it is also not shown on my computer.
please help me I have very important data on the hard drive and I can't lose them.
 
Back