How to recover lost data from unreadable, unmountable, unintialized APFS drive?

I have a 2TB external hard drive with APFS encrypted. One day I inserted it into Mac computer and find encrypted APFS external hard drive is not mounted in disk utility. There are many important documents stored in it, how to recover lost data from unmounted APFS external hard drive?

It is a common problem that hard drive is unreadable, unmountable in Mac computer and usually disk utility fails to repair unreadable, unmountable drive. If the Mac hard drive volume fails to mount and becomes unreadable, inaccessible, the best way to overcome this problem is to recover data from unreadable, unmountable, uninitialized drive. To recover data from unreadable, unmountable, unitialized APFS drive, we need to learn more some knowledge about APFS and Apple APFS Data Recovery.

APFS and APFS data recovery

Apple File System (APFS) is a file system for macOS, iOS, tvOS and watchOS, developed and deployed by Apple Inc. It aims to fix core problems of HFS+ (also called Mac OS Extended), APFS's predecessor on these operating systems. Apple File System is optimized for flash and solid-state drive storage, with a primary focus on encryption.

Data recovery from unreadable, unmountable, uninitialized APFS drive requires us to find a professional Mac data recovery software. What's more, this Mac data recovery software must support APFS file system.

Although Apple has released APFS file sysem several month, but up to now, there are a few software which can support APFS data recovery in market due to technical difficulty, M3 Mac Data Recovery is such a APFS data recovery software which can recover deleted/lost files from APFS drive, recover data from formatted, corrupted, unreadable, unmountable, uninitialized APFS drive, recover data from deleted, lost, misssing, disappeared APFS partition, recover deleted or lost files from encrypted APFS drive, etc. in macOS High Sierra 10.13/Sierra 10.12/10.11/10.10/10.9/10.8/10.7.

Tutorial to recover data from unreadable, unmountable, unitialized APFS drive

Step 1: Download and install this APFS Data Recovery software on your Mac computer.

Step 2: Run this APFS Data Recovery software - M3 Mac Data Recovery.

APFS data recovery software

Step 3: Select unreadable, unmountable, unitialized APFS drive.

If APFS partition is not found, please click "Find Lost APFS Partition" to find previously existing APFS partition and then recover data from APFS partition.

Step 4: Click Next to start scan. If the APFS drive is encrypted, the password is required at this step.

Step 6: After the lost data found, we can preview them or click Recover to recover them.

Fix unreadable, unmountable APFS drive by disk utility

After data recovery from unreadable, unmountable APFS drive is successfully done, we can reformat the unreadable, unmountable APFS drive with following method:

Step 1: Launch Disk Utility from Utilities.

Step 2: Click the icon for your hard drive in the sidebar on the left.

Step 3: Click the Erase tab along the top of the window and enter the related information.

Step 4: Click the Erase button to start format operation. After format completes, the unreadable, unmountable APFS drive will be working again.