Data recovery: APFS volume not mounted on macOS disk utility

Posted by Tim to Mac Data Recovery Tips on March 6th, 2018

My APFS external hard drive is not mounting in disk utility after High Sierra updates, how to repair it so that I can access data again?

"External hard drive is mounting" is a common problem on macOS, This article will introduce two solutions to fix "APFS drive not mounting/mounted" error.

Solution 1: Fix "APFS drive not mounting/mounted" error with Disk Utility

Disk Utility can fix certain disk problems - for example, multiple apps quit unexpectedly, a file is corrupted, an external device doesn't work properly, or your computer won't start up.

Step 1: Open Applications folder, select Utilities and Disk Utility.

Step 2: Select the unmounted APFS drive from left panel, then click "First Aid".

Step 3: Click Run.

If Disk Utility cannot repair unmounted APFS drive, please go to solution 2 to recover lost data from unmounted APFS drive.

Solution 2: Recover lost data from unmounted APFS drive and then reformat unmounted APFS drive

Data recovery from unmounted APFS drive requires us to find a APFS data recovery software, M3 Data Recovery for Mac is such a APFS data recovery software which can undelete files from APFS drive, recover lost data from formatted APFS drive, recover lost data from unmounted APFS drive, recover lost data from unreadable APFS drive, recover lost data from crashed APFS drive, recover lost data from corrupted APFS drive, recover deleted/lost APFS partition, recover lost data from encrypted APFS drive, etc. on macOS 10.15 Catalina/10.14 Mojave/10.13 High Sierra/10.12 Sierra and Mac OS X 10.11/10.10/10.9/10.8.

Tutorial to recover lost data from unmounted APFS drive

Step 1: Download and install M3 Data Recovery for Mac on your Mac computer.

Step 2: Launch M3 Data Recovery for Mac.

APFS data recovery software

Step 3: Select the unmounted APFS drive and then click Next to continue.

If the unmountable drive is encrypted APFS, please enter the unlock password as below:

Enter the password to scan lost files from encrypted APFS drive with M3 Data Recovery for Mac

Step 4: M3 Data Recovery for Mac is scanning lost data from unmounted APFS drive.

Scan lost data from unmounted APFS drive with M3 Data Recovery for Mac

Step 5: Select the found data and then click Recover to save them.

Recover lost data from unmounted APFS drive with M3 Data Recovery for Mac

After data recovery is successfully done, please select the unmounted APFS drive in disk utility and then click Erase button to reformat it. The unmounted APFS drive will be working again after format completes.