15.5.5 external hard drive not showing up

Hi nogoats,

We appreciate you taking the time to work through those steps. At this point I'd suggest using these steps:

• Start your Mac in safe mode, then connect the drive: How to use safe mode on your Mac
  • If the drive is recognized, restart your Mac normally and test again.
• Use First Aid via Disk Utility to see if you're able see and repair the drive: Repair a storage device in Disk Utility on Mac

If you continue to have trouble, reach out to Apple for additional assistance: Contact Apple Support

Best Regards.

Hi nogoats,

Thanks for reaching out in Apple Support Communities. I understand that after the most recent update to macOS Catalina your external hard drive isn't detected by your Mac. I can see why you'd reach out about this; I'd like to help. I'd recommend reviewing the information in the following resource; the title doesn't match to your situation exactly, but the steps and information can help: If a Mac accessory needs more power or is using too much power

If you continue to have trouble, use these steps to reset the SMC and NVRAM of your Mac:

How to reset the SMC of your Mac

Reset NVRAM or PRAM on your Mac

Let me know what you find.

Best Regards.

Hi nogoats,

Thanks for working through those steps. Per the LaCie Support website, Rugged drives are supported in Catalina: Compatibility with macOS 10.15 - Catalina

If possible, you may want to test the drive with another device to verify it's still working properly as well.

Since you continue to have trouble with the drive being recognized, reaching out to Apple for assistance would be the best next step: Contact Support

Take Care.