My Passport don't wake up on Mac

WD External Drives WD Portable Drives
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No, they have not fixed this problem. In fact, when I called WD support, he said I did not have to install WD Discovery, I told him I wanted the features, he said nothing. Dead give away that problem was not fixed.

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You can try the below DIY methods to fix the external hard drive sleep issues on Mac:

  1. Troubleshoot by reconnecting the external hard drive.
  2. Reboot your Mac.
  3. Go to the Energy Saver window from System Preferences and tweak the macOS sleep setting.
  4. Try reinstalling hard drive software.
  5. Try installing the latest version of macOS.
  6. Repair the external hard drive using Disk Utility.

Further, you can also check the below link for steps to be followed in each method above:

Hope it will help!