Solutions to Fix Mac Unable to Mount Internal Hard Drive

We will introduce effective methods to fix the “Internal Hard Drive Not Mounting on Mac” error, also known as the Macintosh HD not mounting issue.

When you encounter the internal hard drive not mounted error, your Mac gets stuck on the startup screen and soon becomes unbootable, potentially causing a nightmare of data loss. We aim to help you fix the unmounted error triggered by issues like the "com.apple.DiskManagement.disenter error 0", system crashes, or a corrupted file system.

Recover Data from Uninstalled Internal Hard Drive with Software

Data Recovery Wizard for Mac is a tool that helps users recover stored data quickly and securely from unmounted internal or external disks. For instance, when your internal hard drive, like disk0s2 not mounted, fails to mount on your Mac, it can scan the data on the disk and display all recoverable files in a short time.

Follow the below steps to recover data from an unmountable disk:

Step 1: Search for the Lost File

In macOS Sierra, High Sierra, Mojave, Catalina, Big Sur, Monterey, Ventura, and the latest Sonoma, select the disk location where you want to search for lost files (it can be an internal HDD/SSD or a removable storage device). Then, click the “Search Lost Files” button.

Note: Before data recovery, it's recommended that you click “Disk Backup” from the left sidebar to create a backup of your Mac to prevent further data loss. After the backup, the software can recover data from the Mac backup, and your computer can write new data again.

Step 2: Browse the scan results

Mac Data Recovery Wizard immediately scans the disk volume you select and displays the scan results.

Step 3: Select the files and recover them

From the scan results, select the files you want to preview and then hit the “Recover” button to get them back.

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Solution 1: Restart your Mac and check the internal drive again

Sometimes, restarting your Mac can fix system issues and quickly remedy a mounting problem. Click the Apple icon in the top menu bar, then click “Restart…” After a few seconds, your Mac will reboot and you can check if the internal hard drive has mounted.

Click Restart.

Solution 2: Run 'First Aid' to repair an unmounted internal hard drive

macOS includes a repair tool called First Aid that can be used to fix disk errors. Here's how to run First Aid on an unmounted internal drive:

Step 1: Open Finder > Applications > Utilities > Disk Utility.

Step 2: Open Disk Utility, select the unmounted internal drive, and click the “First Aid” button in the top menu.

Run First Aid on the internal hard drive:

Step 3: Click “Run,” and then wait for the “First Aid” process to finish.

If the First Aid process fails, recover your data with the help of software, and then consider the third solution – formatting the unmounted internal hard drive.

Solution 3: Erase the unmounted internal drive and reinstall macOS

If the internal drive's file system is damaged, macOS can't mount it. In that case, you'll need to erase the unmounted disk and reinstall macOS.

Warning: Erasing a disk removes all its data, so back up important data first, or use data recovery tools to retrieve stored data before formatting.

After saving the data, proceed as follows:

Step 1: Open Disk Utility and select the unmounted internal drive.

Step 2: Click the “Erase” button in the top menu, give your reformatted internal drive a new name, and select its new format.

Step 3: Boot your Mac into Recovery Mode, then select “Reinstall macOS” from the macOS Utilities window.

Conclusions

This article outlines 3 effective methods to fix the “internal hard drive not mounting” error on your Mac. To avoid data loss during the repair process, download the “Data Recovery Wizard” for Mac tool immediately to retrieve your stored data from the unmounted disk.

Q&A: Common Issues with Macs Not Recognizing Internal Hard Drives

Here are some questions people also ask when searching for how to fix an internal hard drive not mounting; you might want to check them out.

1. How do I force-mount an internal hard drive on a Mac?

Follow the steps in our guide on how to mount a disk on Mac.

Step 1: Open Disk Utility and select the internal hard drive you want to work with. If it doesn't appear, click the Show All Devices option.

Step 2: Click the “Load” button to force the internal drive to mount.

Why can't my Mac read the built-in hard drive?

If your internal hard drive is not showing up in Disk Utility and your Mac is unable to read it, the issue might be due to an incompatible file system on the internal hard drive, a corrupted operating system, or a damaged internal hard drive.