APFS container won't mount, how to fix?
APFS has replaced the older HFS+ as the default files system on Mac. The most vital improvement of APFS is to introduce space sharing, which helps us manage free space more efficiently. APFS indicates that volumes within a common container can share available free space. But if APFS container won't mount, all files stored on these volumes turn to be inaccessible. Unable to mount corrupted APFS container? This passage will show you three feasible solutions.
Why APFS container can't be mounted?
If APFS container won't mount, there may be corruptions on volume header, catalog record or file directory. For example, the fsroot tree of an APFS volume is invalid. Because whenever we want to view the existing files or save new data on an APFS volume, the operating system has to check these three parts and then the APFS container can be mounted. These corruptions can be caused by virus attack, accidental deletion of important system files, power failure, unsafe ejection, and other improper operations.
How to fix APFS container won't mount?
If we didn't back up useful data before, when APFS container can't be mounted, the first thing is to retrieve all files from APFS drive/volume. In this case, a professional APFS data recovery program can be helpful, here iBoysoft Mac Data Recovery is highly recommended.
Step 1: Recover lost data from unmountable APFS container
iBoysoft Data Recovery for Mac is the best APFS data recovery software that enable us to recover lost data from unmountable/corrupted APFS container. Also, it can recover deleted/lost data from APFS volume, recover lost data from formatted APFS drive, recover lost data from unmountable, unreadable, inaccessible APFS hard drive, external hard drive, USB flash drive, SD card, memory card, pen drive, etc., recover deleted/lost partition.
Apart from APFS data recovery, iBoysoft Data Recovery for Mac is able to recover lost data from HFS+, HFS, exFAT, FAT32 drives on macOS 11/10.15/10.14/10.13/10.12 and Mac OS X 10.11/10.10/10.9/10.8/10.7.
1. Download and install iBoysoft Data Recovery for Mac on Mac
2. Launch iBoysoft Data Recovery for Mac, choose "Find Lost APFS Partitions" on the upper right corner of the interface.
3. Select the drive where the unmountable APFS container exists and click "Next" to continue.
4. Choose the APFS container which can't be mounted then click "Next" to scan data.
5. Preview the listed searching files, choose files we need, and click "Recover".
Step 2: Repair unmountable APFS container with Disk Utility
1. Launch Disk Utility.
2. Choose the unmountable APFS container.
3. Select First Aid in the top center and click Run.
Step 3: Repair unmountable APFS container with fsck command
1. Start your Mac in single-user mode. Restart it, and then press and hold the Command+S keys while it boots.
2. Type the command /sbin/fsck -fy into the terminal and press Enter to start a file system check.
3. When the fsck command has your disk checked and repaired, type reboot and press Enter. Your Mac will reboot and return to the usual login screen.
Step 4: Reformat the unmountable APFS container
If you can't repair the APFS container, you need to erase it in Disk Utility.
1. Launch Disk Utility.
2. Select the unmountable container on the left part of the window.
3. Click Erase on the top of the window.
4. Complete related information (name, format), then click Erase.
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