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Outdated macOS versions can’t recognize the flash drive.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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