

If the USB flash drive not detected by Mac due to hardware problems, you won't see the connected USB device under the USB Device Tree. Simply click the Apple logo at the upper left of your Mac > About this Mac > System report > USB, and then all your connected USB devices will show up with detailed information as the picture below. It's easy to confirm that your Mac has already recognized the USB device when it is not showing up in the Finder or the desktop.
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Then, how to check if the USB flash drive is recognized by Mac?

That in-between connections, actually, could be the first cause for USB drive not showing up on Mac. Jump drives are directly plugged into USB ports on Mac while SD cards and NM cards need card readers before you access them through USB ports. There are seven solutions to fix USB flash drive not showing up on Mac or Mac not recognizing USB device: Fix 1: Check USB cable, USB connection and USB ports. How to fix USB flash drive not showing up on Mac? Recover data and reformat USB flash drive Change Finder preferences to show up USB flash drive in Finder Change Finder preferences to show up USB flash drive on Mac desktop Check USB cable, USB connection and USB ports Now, let's dive into 7 detailed solutions. And then the hard drive won't be showing up on Mac desktop or in Finder. However, sometimes, the USB flash drive won't be mounted correctly. Normally when you plug a USB flash drive into your Mac, you can find the connected USB device on Mac desktop or in Finder.
