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If not, follow the next section to access. If you can see an icon representing your USB drive, just double-click to access it. So connect your USB drive, then click the yellow minimize button in the top-left corner of all your open windows to reveal the Desktop. Take a look online to make sure the files you're trying to transfer to the Mac are compatible with macOS. By default, you should be able to find your USB drive on the Desktop of your Mac. If your drive shows up on a Mac, but it appears to be empty, it could be a problem with the types of files you're trying to transfer. Make Sure the Contents of the Drive Work With macOS If it doesn't work anywhere, then you can be certain there's a problem with the drive. Try using a different drive or a different port instead.Īlternatively, try using your USB drive with a different computer to see if it works with that. If your USB flash drive or external hard drive doesn't show up in Disk Utility, then there is probably a physical problem with the drive or the USB port on your Mac. Click the First Aid button in Disk Utility to fix any issues with the drive, then try to access it in Finder again. If your USB drive is in ExFAT, FAT32, APFS, or Mac OS Extended format then it should work on your Mac. So you'll need to reformat your drive if it uses NTFS format.