How to fix "Disk Utility cannot mount APFS volume"?

Posted by Katrina to Mac Data Recovery on January 8th, 2018

Yesterday when I plugged my APFS formatted external hard drive in my Mac computer, I didn't see anything about it in Finder. So I opened Disk Utility, I found the APFS external hard drive, but I couldn't mount it. I also ran First Aid, it told me "First Aid process has failed, if possible back up data on this volume". How can I fix Disk Utility cannot mount APFS volume without data loss?

APFS is the default file system of macOS Catalina 10.15/Mojave 10.14/High Sierra 10.13, which has improved a lot in data security and file management. However, you might have encountered "Disk Utility cannot mount APFS volume" error which could happen to not only external drives, but also internal drives.

The reasons why Disk Utility cannot mount APFS volume can be file system corruption, unsafe ejection, volume header corruption, Disk Utility failure, virus attack, etc. No matter what it is, you'll have no access to the files stored on the unmountable APFS volume.

How to fix "Disk Utility cannot mount APFS volume"?

To avoid data loss, the safest way is to retrieve data from unmountable APFS volume with professional APFS data recovery software as soon as possible, and then fix 'Disk Utility cannot mount APFS volume' error by formatting.

Step 1: Recover data from unmountable APFS drive with iBoysoft Mac Data Recovery

iBoysoft Mac Data Recovery is the best APFS data recovery software that can recover data from unmountable APFS drives, recover data from formatted APFS drives, recover data from inaccessible APFS drives, recover deleted/lost APFS partitions, recover deleted/lost data from APFS partitions, recover data from unreadable APFS hard drives, etc.

Besides APFS data recovery, iBoysoft Mac Data Recovery also supports file system HFS, HFS+, FAT32 and exFAT. It fully compatible with storage devices like hard drive, external hard drive, USB flash drive, SD card, memory card, pen drive, etc.

Tutorial to recover data from unmountable APFS drive with iBoysoft Mac Data Recovery

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

2: Launch iBoysoft Mac Data Recovery. Select the unmountable APFS drive and click "Next" button to scan all lost data.

Recover data from unmountable APFS drive with iBoysoft Mac Data Recovery

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

Step 2: Fix the unmountable APFS drive by reformatting

After successfully restored all lost data, we can fix APFS volume not mounted by reformatting it as the steps below without worrying about any data loss.

1: Launch Disk Utility from Utilities.

2: Click the icon of unmountable APFS 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?