My Passport Ultra Not Recognised On PC Or Laptop

I was using my WD My Passport Ultra 1TB hard drive up until recently on my XBOX ONE until with no apparent reason it stopped working/being recognised by XBOX? I removed it and attached to my PC (Windows 7) and laptop (Windows 8) to see if it was working and to see if I coiuld reformat it. The drive is recognised when I look in device manager and the light flashes when I plug it in and I can hear the drive spinning but when I try to access the drive to reformat it is not showing in Windows explorer so I can do nothing with it. Both the PC and Laptop do the same thing, I have attached pics to show what I mean.

Anybody got any ideas on how to rectify this?

Hello and welcome to the WD community.

Does the unit show up when you go to disk management on computer management for windows? You can get there by right clicking on the computer icon, and clicking on manage.