Step 1: Go to /Applications/Utilities/Disk Utility/, then click Continue. Whenever you can't mount a WD hard drive or My Passport for Mac is not working, First Aid should be a good disk repair tool. First Aid is a Mac built-in tool to verify and check minor problems of a hard disk. The steps you need to take will depend on the version of MacOS. Note: Disk Utility had a bit of a makeover in OS X El Capitan and as a result the way that you repair a disk has changed slightly.
If you can't mount the WD My Passport hard drive for Mac manually, there should be some file system problems in this drive. Method 2: Repair WD My Passport for Mac drive with First Aid. Restart your computer and insert/plugin your passport again into PC. Open its properties and then open drivers, simply uninstall it. You can see your passport drive visible there. In Control Panel, go to Devices and Printers. Easiest Way to Fix WD Passport Not Showing Error
