Normally when you plug in a USB flash drive to your Mac's USB port, you will see it showing up on the desktop or in Finder. Sometimes however, the USB flash drive won't be mounted correctly, you have no access to the files stored on it. In this article, we will offer you solutions to fix USB flash drive not showing up on macOS Catalina/Mojave/High Sierra and recover data from the not mounting USB flash drive.
Solution 1: Check if the USB flash drive is properly plugged in.
Try to re-plug the USB flash drive to Mac and see if it shows up. If not, you could move on to other solutions.
Solution 2: Make sure your Mac is set to show up USB flash drive on the desktop.
Occasionally, your Mac has already recognized the USB flash drive but not shown it on the desktop. Thus, you should go to Finder > Preferences > General and make sure the "External disks" option is ticked. Then you'll see the USB flash drive showing up on Mac desktop.
Solution 3: Make sure your Mac is set to show up USB flash drive in the Finder.
Go to Finder > Preferences, select Sidebar, and under Locations make sure "External disks" option is selected again.
Solution 4: Verify if it is the USB flash drive's issue.
If the USB flash drive shows up in the Finder, click on it. Can you see the contents of the USB flash drive shown up? If it merely shows the device but you can't access the files, probably the USB flash drive is the issue.
To further confirm, go to Applications > Disk Utility. If the USB flash drive isn't showing up there, you can be sure the drive is corrupted or damaged.
Solution 5: Reformat the not showing up USB flash drive and recover data.
Please note that reformatting the USB flash drive will erase all the files stored on it. In order to avoid unwanted data loss, it's necessary to recover data from the not showing up USB flash drive in advance.
iBoysoft Mac Data Recovery is trustworthy and professional USB data recovery software that is able to recover data from not recognizing USB flash drives, unreadable USB flash drives, unmountable USB flash drives, external hard drives, SD cards and corrupted, damaged, formatted, inaccessible drives on macOS Catalina 10.15/Mojave 10.14/High Sierra 10.13/10.12 and OS X 10.11/10.10/10.9/10.8/10.7. If you mistakenly erased the USB flash drive, don't worry, iBoysoft Mac Data Recovery is also able to help you recover data from formatted drives with ease.
In this solution, 4 steps are required to fix USB flash drive not showing up on Mac problem without data loss.
Step 1: Recover data from the not showing up USB flash drive with iBoysoft Mac Data Recovery.
1. Download and install iBoysoft Mac Data Recovery.
2. Launch iBoysoft Mac Data Recovery.
3. Select the not showing up USB flash drive and click "Next" button to scan all lost data.
4. Preview the searching results, choose files you need, and click "Recover" to get them back.
Step 2: Select the not showing up USB flash drive in Disk Utility sidebar.
Step 3: Click Erase on the top.
Step 4: Finish the process to format the USB flash drive.
After the process finished, the USB flash drive will show up on Mac correctly.
Solution 6: Ask for help from your local professionals
If the USB flash drive still not showing up on Mac, it might be damaged physically. Under this circumstance, you have to take it to specialists for suggestions.