Mac internal hard drive won't mount, how to fix?

Posted by Katrina to Mac Data Recovery on May 3th, 2018

Most of the time, the Mac internal hard drive, or the Macintosh HD, is the system/startup/boot drive of the Mac computer. Thus, if the Mac internal hard drive won't mount, you may suffer problems like Mac computer stuck on loading/login screen or Mac not bootable at all. It is annoying especially when you have important files stored on the unmountable Mac internal hard drive.

This post will show you 5 solutions to fix the Mac internal hard drive won't mount issue. But before that, you'd better check whether you have a backup copy of data, or follow the tutorial below to recover data from the unmounted Mac internal hard drive.

How to recover data from the not mounting Mac internal hard drive?

As mentioned above, your Mac computer won't boot if the internal hard drive isn't mounted. Moreover, your any attempts to fix it may write new data which overwrites the original data on the drive. Thus, to avoid data loss, you're recommended to recover data from the unmountable Mac internal hard drive as the first step.

iBoysoft Mac Data Recovery can recover data from failed internal Mac hard drives, even when your Mac computer fails to boot. Moreover, the program can also recover data from formatted drives, recover data from inaccessible drives, and recover data from unreadable drives, and so on. It's fully compatible with macOS Mojave 10.14/High Sierra 10.13/10.12 Sierra and OS X 10.11/10.10/10.9/10.8/10.7.

Method 1: If you have only one Mac computer

Please directly run iBoysoft Mac Data Recovery bootable media from iBoysoft Server and recover lost data from the unmountable Mac internal hard drive.

Method 2: If you have two Mac computers

Step 1: Download iBoysoft Mac Data Recovery on another Mac computer.

Step 2: Install and launch iBoysoft Mac Data Recovery.

Step 3: Click iBoysoft Data Recovery on the menu bar and then select "Create Boot Drive".

iBoysoft Data Recovery create bootable drive

Step 4: Insert a USB drive into the healthy Mac computer.

iBoysoft Data Recovery create bootable drive

Step 5: Follow the wizard to create a bootable recovery drive.

iBoysoft Data Recovery create bootable drive

iBoysoft Data Recovery create bootable drive

Step 6: When finishes, please insert iBoysoft Mac Data Recovery bootable USB drive into the unbootable Mac computer. Then, press the Power button and Option key (⌥) to start the computer.

iBoysoft Data Recovery create bootable drive

Step 7: Select iBoysoft Mac Data Recovery from the boot options.

iBoysoft Mac Data Recovery can also recover deleted/lost documents, photos, audio, videos, emails from APFS, HFS, HFS+, exFAT, FAT32 formatted drives. Apart from internal hard drive data recovery, iBoysoft Mac Data Recovery also supports recovering data from external hard drives, USB flash drives, SD cards, memory cards, and Pen drives, etc.

How to fix Mac internal hard drive won't mount issue?

After recovering data from the unmountable Mac internal hard drive, you can now fix the Mac internal hard drive won't mount issue without worrying about data loss.

Solution 1: Repair unmountable Mac internal hard drive via First Aid

Disk Utility is desined to repair minor errors on disks. So you can try to fix the unmountable Mac internal hard drive with Disk Utility in Recovery Mode.

Step 1: Boot to Recovery Mode by restarting the Mac computer while pressing and holding down Command and R keys at startup.

Step 2: Select Disk Utility and click Continue.

Step 3: In the sidebar, select the unmountable Mac internal hard drive you wish to repair.

Step 4: Click the First Aid button.

Step 5: Click Repair Disk.

Solution 2: Run FSCK command in Single User Mode

If Disk Utility stopped repairing Macintosh HD, you can then try out FSCK command in Single User Mode, which is helpful in isolating startup related issues.

Step 1: Restart your Mac and, before the Apple logo appears, hold down Command and S keys. This will boot your Mac into Single User Mode.

Step 2: Type in: /sbin/fsck -fy.

Step 3: If you see "File system was modified", then re-type in the command again until you see "The volume [name] appears to be OK".

Use FSCK command in Single User Mode

Step 4: Type in reboot to restart your Mac.

Solution 3: Try Safe Mode

Just like Single User Mode, Safe Mode is able to resolve problems that prevent your Mac from booting up.

Step 1: Shut down your Mac computer.

Step 2: Start the Mac up while holding down Shift. Release the Shift key when you see the login window.

Step 3: If your Mac boots into Safe Mode properly, then try restarting and booting as normal.

Solution 4: Erase the unmountable Mac internal hard drive and reinstall macOS

If you still can't mount the internal hard drive on your Mac, there might be serious directory structure or file system corruption in the disk. In this case, your last chance is to erase the Mac internal hard drive and then reinstall Mac operating system so as to make the Mac computer work again. However, this process will be destructive to the data on the drive. Thus, make sure you have recovered data with iBoysoft Mac Data Recovery.

Step 1: Boot your Mac into Recovery Mode.

Step 2: Go to Disk Utility and erase the unmountable Mac internal hard drive.

Step 3: Go back to macOS Utilities screen and select Reinstall macOS. Then, follow the onscreen wizard to reinstall the OS.

Solution 5: Look for help from local data recovery company

If your Mac internal hard drive still can't be fixed through the solutions above, the drive might have hardware problems. You'd better send it to local data recovery company.

Still have questions?