However, for some reasons, macOS comes with read-only support for NTFS its disabled-by-default write support for NTFS is unstable. NTFS (New Technology File System) is a proprietary file system developed by Microsoft.
Solution 4: Check if the external hard drive is NTFS formatted. Go to Finder > Preferences > Sidebar and make sure the "External disks" option under "Locations" is ticked. You can also set your Mac to show external hard drives in Finder. Then you'll see the external hard drive mounted on the desktop. Under such circumstance, you should go to Finder > Preferences > General and make sure the "External disks" option is ticked. It's also possible that your Mac has already S olution 3: Check if your Mac is set to show mounted drives on the desktop. To check this error, you can unplug the problematic external hard drive and plug a functional external hard drive into this USB port to see if it can be mounted normally. As you can see, insufficient power supply or damaged USB ports could also lead to external hard drives not mounting in macOS Catalina/Mojave/High Sierra.
That's because there're USB 3.0 and USB 2.0 ports and they have some differences: USB 3.0 has higher transfer rates, provides more power, more bandwidth, etc. If your external hard drive or USB flash drive is not mounted on Mac, try plugging it into another USB port or a USB hub. Solution 2: Check if the USB port/USB hub is unmatchable, damaged or lack of power. Therefore, you need to make sure that the connection, i.e. Sometimes the cable itself will become hot because of a faulty connection. If the unstable connection is the case, your external hard drive would not be mounted even with a slight disturbance. Since the connection between your Mac and external hard drives relies on cables, loose connections could be the cause that your external hard drive is not recognized by your Mac computer.
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Read more about Mounting a disk How to fix external hard drive not mounting in macOS Catalina/Mojave issue? Solution 1: Check if the hard drive is properly plugged in. 1.8: Recover lost data and reformat the unmountable external hard drive.Ģ.1.7: Check if the external hard drive is corrupted.1.6: Fix the unmountable external hard drive with Terminal.1.5: Check if the external hard drive is mountable in Disk Utility.1.4: Check if the external hard drive is NTFS formatted.1.3: Check if your Mac is set to show mounted drives on the desktop.1.2: Check if the USB port/USB hub is unmatchable, damaged or lack of power.1.1: Check if the hard drive is properly plugged in.How to recover lost data if Mac won't boot after Mojave update?
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