External Hard Drive not recognized after using it in Windows I have a HFS external hard drive. I wanted to transfer a large file to my brother so I made him install the Paragon HFS+ program to be able to read it. 

During the process something happened and the hard drive stopped working. Now I can't mount it in my Mac.

I can see that Windows recognizes the device but can't access it, while it is not recognizable in my Mac (neither in Disk Util or by running the diskutil command).

I don't know if there is a way to fix this problem.
Can it still be recognized? Try First Aid or copying the files and erasing to ExFat so that you have access to large files on macOS and Windows.