Give your Mac a moment to recognize it and make it available in Finder.

Take a look online to make sure the files you're trying to transfer to the Mac are compatible with macOS. First, plug your USB flash drive into an available USB port on 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. Another way to access your flash drive is by going to Finder and clicking the flash drive icon in the sidebar on the left. 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 Format pop-up menu, then choose a file. If the Scheme pop-up menu isn’t available, make sure you selected the storage device you want to eraseit’s at the top of the hierarchy. Click the Scheme pop-up menu, then choose GUID Partition Map. Click the First Aid button in Disk Utility to fix any issues with the drive, then try to access it in Finder again. In the sidebar, select the storage device you want to erase, then click the Erase button.

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.

Mac memory stick