
Solution 4: Fix the unmountable USB flash drive by reformatting Step 3: Select First Aid in the top center and click Run.Step 2: Choose the grayed-out USB flash drive.Fortunately, you can use First Aid in Disk Utility to repair this unmountable USB flash drive. If the Mount button is greyed out and you can't mount this USB flash drive manually, then there could be some disk errors. Step 4: Select Mount in the upper menu bar.Step 3: Click on the name of your USB flash drive.Step 2: Click on View option and choose "Show all devices".If it is greyed out in Disk Utility, you can manually mount this USB flash drive. If you still can't access your USB flash drive thereafter, you can go to Disk Utility which is a built-in utility to fix disk problems.

Solution 3: Check and repair this USB flash drive with Disk Utility

Step 2: Double-click on its icon to open it and choose USB in the left sidebar.Step 1: Go to Utilities and choose System Information.If you plug this USB flash drive into your Mac computer but get no sign that this drive is mounting on Mac, you can check System Information to see if this USB flash drive is showing up. Solution 1: Check the USB flash drive in System Information Here are 4 solutions to this unmounted USB flash drive issue according to different causes, you can check them one by one. No matter what results in unmountable USB flash drive, it's urgent to fix/repair USB flash drive not mounting issue on Mac.
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How to fix/repair USB flash drive not mounting issue on Mac? Disk Utility failure, log file corruption, OS malfunction on this Mac.File system errors, volume header corruptions, etc.


What makes the hard drive not working problems like USB flash drive unmounted on Mac can be various. Why the USB flash drive is not mounting on Mac? But don't worry, this page talks about the reasons for this issue, and how to fix "USB flash drive not mounting on Mac" without data loss even if external hard drive is not showing up on Mac. However, if the USB flash drive is not mounted on Mac, you will lose access to the USB flash drive as well as to the data stored on it. It is user-friendly that Mac will automatically mount the inserted USB flash drives. How can I fix/repair USB flash drive not mounting issue on Mac? But the USB flash drive was grayed out in Disk Utility and I could not mount it. So, I went to Disk Utility, it was there. When I plugged in my USB flash drive on macOS High Sierra, I can't see it in Finder or on the Desktop.
