
Step 1: Click Finder and choose Preferences in the top menu bar.

Check the Finder Preferences and see if it will appear. Sometimes, you just can't find the USB flash drive in Finder and on the desktop, but actually, it is mounted on your Mac and just not showing up. If your USB flash drive is not showing up in the right box, you can try to re-plug it, or change another USB port and cable to connect it. Step 3: Check if your USB flash drive is detected by the system in the right box. 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. 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.Faulty connections like broken cable and wobbly USB port.The possible reasons for this issue include: This is because that this external drive is connected to the Mac computer through USB cable, USB port and many other components. 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? How to recover lost data from unmounted/unrecognizable USB flash drives? 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 the 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 the 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.
