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But don't worry, macOS has a built-in repair tool, called First Aid, to fix minor disk errors. You can try to fix the external hard drive not mounting issue with this useful program. If your external hard drive can't be recognized by your Mac and First Aid failed to repair it, you can try to remount via Terminal by following the steps carefully as below:. Type in diskutil list.

This is to check if your system recognizes this drive. Physically remove the external drive and then re-plug it. Hopefully, your external hard drive will be mounted in macOS Mojave. If unfortunately, none of the above solutions worked, it's very likely that the files system of the external hard drive is corrupted or damaged too seriously to be recognized by macOS Mojave. It could be the result of file system broken, virus attacks, improper ejection, etc. And if you have no important files on this drive, you can directly assign a new file system for this external hard drive by reformatting.

But what if you have invaluable data that you don't want to lose on this inaccessible external hard drive? In this case, recovering data from this drive with professional data recovery software, such as iBoysoft Mac Data Recovery , would be your access to this unmountable external hard drive. Step 2: Launch this program. Select the unmountable hard drive and click "Next". The program will start scanning this drive for lost files.

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Step 3: After the scanning process finishes, you can double click the found files and preview them. Step 5: Go through the recovered files and make sure your desired files are recovered from this external hard drive successfully. If, unfortunately, your data lost from external hard drive in macOS Mojave, whether the disk was formatted accidentally or files were deleted mistakenly, you can recover lost data from unmountable hard drive with iBoysoft Mac Data Recovery.

But compared with data recovery software, the best way to escape from data loss is to back up your files on a regular basis. Mounting a hard disk makes it accessible by the computer. This is a software process that "activates" the disk, which makes the folders and files on the disk readable by the computer.

If a hard drive is physically connected, but not mounted, the computer will not recognize it.


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Even though most operating systems, such as macOS, will mount newly connected disks by default, you still can't avoid accidental problems in that the hard drive is connected through devices like cable, USB port, etc. To fix external hard drive not mounting issue, you need to exclude the errors one by one, and to avoid external hard drive not mounting on macOS Mojave, remember to safely unmount the external disk before ejection to avoid possible file data corruption.

EN FR. Store current Mac Data Recovery. Windows Data Recovery. NTFS for Mac. Table of contents 1. How to recover data if Mac won't boot after Mojave update? Read more about Mounting a disk. Free Download.

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Still have questions? Contact us. How to recover files from broken flash drive on Mac? How to recover corrupted SD card on Mac?

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Fix external hard drive greyed out in Disk Utility Mac won't boot, what to do? How to fix Seagate external hard drive not readable on Mac?


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