MY passport not recognized on my computer

Recently i used a mac laptop and put my external hard drive into it. The mac is not my computer and when i tryed to put my external hard drive into my own pc it is not recognised. the only thing that is recognised is the CD drive which contains the manual and other stuff like that. Has anyone got any suggestions would be greatly appreciated?

It’s possible that the drive may have been corrupted by the Mac.  Check in Disk Management on you pc to see if the drive shows up, and what it says about the drive.