Expecting to see the USB drive on desktop after connecting it to Mac?
Mac may disappoint you sometimes: your flash drive may be not detected.
Why is this happening?
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How to fix when USB not showing up on Mac?
Find your answers in the following content provided byMiniTool Solution.
Besides, it shows you how to troubleshoot when internal hard drive not showing up.

Can you fix USB not showing up on Mac?
How to find SD card on Mac?
Actually, the methods and solutions are similar tohard drive not showing upon Mac.

The broken cable/port, or insufficient/unstable power supply could make your Mac not recognizing USB.
Thats all about how do I get my Mac to recognize my USB.
Internal Hard Drive Not Showing Up Mac
What about hard drive not showing up?

Pleaseread this pagewhenexternal hard drive not showingup on Mac.
Fix 1: modify Mac tweaks.
Fix 2: check in Disk Utility.
In this case, you should follow these fixes to repair.
Fix 1: repair inmacOS recovery mode.
You should boot into the macOS Recovery mode and run First Aid:
Fix 2: check in Terminal.
This kind of drive is invisible to users unless you check it in Terminal.