External drive is not working

Recently i got the latest version of Macbook air, but i am unable to open my external hard drive (Western Digital), can you please help me, how to fix this issue, what I have to do to open it in mac book, It was perfectly working with others computers, windows.

The reason for this is most likely that the drive is not in the correct format.  Just curious, if you plug the drive in, and you open Disk Utility (you can search for that in spotlight) What shows up? Can you see the drive appear, even if it doesn't have a partition underneath it or it is greyed out?

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