To erase the disk, open Disk Utility (Applications > Utilities folder), select the USB drive in the sidebar, go to Erase tab and select exFAT on Format. ExFAT is compatible with Mac OS X 10.6.5 or newer, Windows Vista, Windows 7 and Windows 8. Erase the USB disk using exFAT. Welcome to the Apple Support Communities.Repair USB flash drive with First Aid 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 Check the Drives File System Before jumping on the formatting, it is important to check your drives file system.Now, let's dive into 7 detailed solutions.Select the Disk Partition option, then choose Mac Partition as the format you want to format in (this allows you to use the device on both Windows and Mac.In this case, simply try another USB port to connect this USB flash drive to your Mac.Reset USB ports on Mac to detect USB driveResetting USB ports on Mac is another way to solve Mac not recognizing USB flash drive problem. And some USB ports may be deformed, lack of power, or dusty. So, hopefully, the USB flash drive would show up after a second try.Try another USB port to connect this USB flash drive.Most computers, including PC and Mac, have multiple USB ports. 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.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.In case it's the USB port, cable, or card reader that stops your USB drives working on the Mac, you'd better try these things before you proceed with other solutions.Try to re-plug the USB flash drive into your Mac and see if it shows up.Sometimes, the Mac just is zoning out and fails to recognize the USB flash drive, or you didn't plug the USB drive into USB port in a right way at the first time. That in-between connections, actually, could be the first cause for USB drive not showing up on Mac.Then, how to check if the USB flash drive is recognized by Mac?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. Ask for help from a local specialistHow to fix USB flash drive not showing up on Mac?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.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.
Format A Thumb Drive For Windows From Update USB DriverWhenAny updates available will be listed and able to be downloaded or you will be told your software is up to date.Fix 5: Repair USB flash drive with First AidIf you can see USB flash drive but it is not mounting in Mac Disk Utility, in this case, you can try macOS built-in First Aid to repair the errors on USB flash drive. Click on the Apple in the upper left corner of the screen. Fix 4: Reinstall or update USB driverWhen your USB device is not detected by Mac, you should check if any USB driver updates are available, please do the following steps: Then you'll see the connected USB flash drive showing up on Mac desktop.Fix 3: Change Finder preferences to show up USB flash drive in FinderGo to Finder > Preferences, switch to Sidebar tab, and check "External disks" option under Locations.You will see the connected USB flash drive in Finder's sidebar. Thus, you should go to Finder > Preferences > General and make sure the "External disks" option is checked. As a result, the data transfer rate of the thumb drive would be lowered and the thumb drive won't work optimally.Fix 2: Change Finder preferences to show up USB flash drive on Mac desktopOccasionally, your Mac has already detected the USB flash drive but you cannot find the connected USB device on Mac desktop. Go to Utilities and open Disk Utility. To ensure those files are in good condition in the corrupted USB stick, you can click to preview them before you finally click the "Recover" button.After you successfully recover data from the unrecognized USB flash drive, it is time to reformat USB drive. On the USB drive.Step 3: Scan for lost data from the unrecognized USB flash drive.After setting how the software scans for lost files, you can go ahead to put it into practice by selecting the not showing up USB flash drive and clicking on the "Scan" button.Step 4: Check files' condition before you recover them from the unrecognized USB flash drive.Once the scan process is finished, you can filter the scanning results and find files you want to get back. Download google apps for macBut if you have anything important, you'd better send it to a local specialist for data recovery help. If you don' have any important data, you can simply replace the damaged USB drive with a new one. Fix 7: Ask for help from a local specialistIf the USB flash drive is not showing up in Mac Disk Utility and System Information, it might be physically failed. Finish the necessary information (name, format, and scheme) to format the USB flash drive.After the process finished, the USB flash drive will show up on Mac correctly. Even though it's inevitable for portable drives to be plugged and unplugged frequently, you can make sure you eject it safely and properly every single time. Don't unsafely eject the USB flash drive. More importantly, it can avoid accident break off when you sit down or bump into something. This could keep your drive away from moisture from your body and dust on your clothes. Don't put USB flash drives in the pockets of your pants of T-shirt, especially, when it's naked. Then, how can we protect it from corruption and not showing up on Mac? Therefore, to avoid unexpected data loss, you'd better do a regular backup of your files. Although you have been taking good care of your USB flash drive, you should know that it has a limited life span.
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