Many people are complaining about the same problem: external hard drive not showing up on Mac.
11 useful solutions are provided here to help users fix hard drive not working on Mac.
4 Useful Methods For Getting Files Off Failing Hard Drive On Mac.
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How to fix hard drive not showing up on Mac?
Ill demonstrate the Solutions from 3 aspects.
If this didnt work, yo try the following methods.

How to fix external hard drive not showing up or recognized on Windows?
External hard drive not showing up or recognized in computers is a common problem.
This article puts forward several ways to fix it.
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#1.
Take a Look at the System Information
Seagate external hard drive not showing up Mac:
Hi.
The Mac Pro is the 2006 Intel Xeon model running 10.6.8 Snow Leopard.

Also, this HDD works in my MacBook Pro, but not the Mac Pro.
If anyone has any useful information, that would be greatly appreciated.
Finally, DisneyWorld got his drive showing up and working after inspected it in System Report.

How to Check Using System Report
Fix External Hard Drive Not Working Analysis & Troubleshooting.
#2.
Check Hardware for Problems
How do I get my Mac to recognize a hard drive connected through USB?

Here are some quick tips.
How to fix when USB flash drive not recognized on Windows?
#3.

Change Finder Preferences
Why is my external hard drive not showing up Mac?
Another common reason is that the Finder preferences options are not proper.
How to change the options?

#4.
If you find theexternal hard diskin Disk Utility but it doesnt shows up, it may be not mounted.
How to mount external hard drive Mac?

#5. and then repair them.
If your external hard drive appears but not shows up on desktop, hey run First Aid.
How to get them back on Mac?
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Some people may want to recover crucial data from their Mac when it cant boot successfully.
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#6.
Repair External Drive by Using Terminal
#7.
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Your Mac cant recognize a drive thats been formatted with a file system that it cannot read.
Can you read a Mac-formatted hard drive on a Windows PC?
#8.

Reset NVRAM
If theres problem with the Macs RAM, it may cause external hard drive not showing up.
you might troubleshoot the problem by resettingNVRAMproperly.
#9.
How to recover a Mac file deleted from a folder or the desktop?
#10.
How to troubleshoot Mac not detecting external hard drive?
#11.
Update macOS
Updating OS is another useful fix for hard drive not showing up Mac.