How to fix external drive not mounting Mac and recover lost data?

Posted by Juno to Mac Data Recovery on October 31th, 2017

Can't mount external drive on Mac? Forget to back up important data? Just download iBoysoft Mac Data Recovery to recover data from unmountable external hard drive and then follow the the below tutorial to fix external drive not mounting on Mac.

"Since updating to macOS High Sierra, my Seagate 1TB hard drive can't be mounted by my Retina MacBook Pro (2014). It appears in Disk Utility but not in Finder or on the Desktop. In Disk Utility, I can't do anything but format it which I do not want to do for there are still useful files on it. Is there any suggestion on how to fix not mounting external drive or recover data from fix not mounting external drive?"

When connecting an external drive to your Mac, you may find that you're unable to mount external hard drive on Mac. This problem may be caused by many factors such as damaged file system, virus attack, unsafe ejection or any other improper operation. But no matter what reason it is, after our external drive becoming unmountable on Mac, the first and most important thing is to restore files on the drive.

Tips for fixing and recovering data from external drive not mounting on Mac

For a not mounting external drive, we still have the possibility to recover files from it, but any further operation on it should be avoided, such as formatting it, saving new files on it. That's because further operations are very possible to cover the original files to make them unrecoverable, and even damage the external drive.

How to fix not mounting external drive on Mac?

Here are step-by-step tutorial to fix external drive not mounted on Mac. But you should know that when running these steps, the original data is possible to be overwritten. Thus, for users who have useful data on the not mounting external drive, make sure you have back up all data before. For those who don't care about data, please skip to the second step.

Step 1: Back up data

When there are still important files on the not mounting external drive, we should firstly recover data from not mounted external drive. As long as our external drive doesn't have hardware problem, iBoysoft Mac Data Recovery can help us recover data from unmountable external hard drive.

iBoysoft Mac Data Recovery is a free data recovery tool that can not only recover data from unmountable external drive, but also recover data from formatted external hard drive, recover data from inaccessible external hard drive, recover data from unreadable external hard drive, recover data from corrupted external hard drive on macOS Mojave 10.14/High Sierra 10.13/10.12 Sierra and Mac OS X 10.11/10.10/10.9/10.8/10.7.

Recover data from not mounting external drive on Mac with iBoysoft Mac Data Recovery

1. Download and install iBoysoft Mac Data Recovery on Mac.

2. Launch iBoysoft Mac Data Recovery.

Recover data from not mounting external drive on Mac with iBoysoft Mac Data Recovery

3. Select the not mounting external drive and click "Next" button to scan all lost data.

4. Preview the searching results, choose files we need, and click "Recover" to get them back.

5. Have a check to ensure we have got all lost data back.

Step 2: Repair unmountable external drive with Disk Utility

After successfully restored all lost data, we can set out to fix external drive not mounting on Mac. Disk Utility's First Aid is a free built-in repair tool to fix disk errors. You can have a try.

1. Launch Disk Utility.

2. Choose the unmountable external drive on the left sidebar.

3. Select First Aid in the top center and click Run.

Step 2: Fix external drive not mounting by reformatting

If Disk Utility can't repair the disk, the external drive might be seriously damaged. The only method is to reformat the external hard drive. Reformatting will erase all data on the external drive, please back up firstly.

1. Launch Disk Utility from Utilities.

2. Click the icon of not mounting external drive on the left part of the window.

3. Click the Erase function on the top of the Disk Utility window.

4. Complete the related information (name, format, scheme), then click Erase button.

Still have questions?