When I plug in my WD Passport for Mac it does not appear in Finder or Disk Utility so I can’t mount it through that/run first aid. It is visible in System Info however and the WD Discovery app but when I click mount through the app nothing happens.
In terms of hardware, I’ve tried multiple USB cables and the light on the passport is flashing but still nothing on my MacBook
When you connect an external hard drive on Mac, it will show up on Desktop, Finder, and Disk Utility. But sometimes the external drive won’t appear in any of these places. To fix the issue, you can try the below methods:
Change MacOS settings under Finder preferences
Reset (NVRAM/PRAM/SMC) Mac firmware settings
Fix external hard drive connectivity issue
Mount or Repair the external hard drive using Disk Utility
Further, I suggest you to check the below link for detailed steps to be followed in each method above.