If you haven’t ticked the option, flash drive would not show up on desktop or Finder. Swift to Sidebar tab, making sure External disks option is selected under Devices.
Tick External disks option on the General tab. Go to Finder menu at the top of the screen, and choose Preferences option from the drop down list. Check Finder PreferencesĪn USB flash drive is not showing up on your Mac may be just because you didn’t allow it to show from the sidebar, you will need to check and adjust the Finder app preferences. Next, try to access the flash drive again. If your Mac won’t recognize the USB flash drive, I suggest you to unmount the disk: Click on Unmount button > unplug the flash drive > wait about 10~15 seconds > plug flash drive back in. If your flash drive is detected, but you still have the trouble accessing the content on the drive, you can run First Aid: click on drive > hit First Aid > run the process to repair the error on the drive. You can open Disk Utility app to check if the USB flash drive is showing up. Reboot your Mac and insert all USB devices, including USB flash drive. Press the power button 5~6 times to completely release the static electricity of the motherboard. Unplug all USB devices and shut down your Mac. Connect the USB device to another Mac computer. Inspect the device for any physical damage or wear. As for USB ports, they can become dirty and worn over time. The damage of USB device would cause flash drive not showing up on Mac, particularly if you’re using a cheap and low-quality product. Give them a try before you buy a new USB flash drive or upgrade your macOS system. The following methods can solve most USB flash drive not showing up on Mac issues. How to Fix USB/Thumb Flash Drive Not Showing up on Mac?Īccording to the reasons, you can find the corresponding solutions. Running apps on your Mac conflicts with the USB flash driver. Mac is in poor performance to recognize external devices. Outdated macOS versions can’t recognize the flash drive. Main possibilities why USB flash drive not detected or recognized: Most problems of flash/thumb drive can be solved effortlessly. When you are stuck on the undetected USB flash drive, investigate each of reasons. There are several root causes that would lead to USB flash drive not showing up on Mac. 
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