How to fix internal hard drive (Macintosh HD) not mounted or showing up?

Updated by Tim to Mac Data Recovery Tips on April 28th, 2021

The internal hard drive in your Mac is called Macintosh HD. It is used to store your Mac operating system files and other data. Without an external hard drive connected, it is the only hard drive on your Mac. Below are the methods to address the Macintosh HD not mounted and internal hard drive not showing up on your Mac.

How to fix Macintosh HD not mounted issue

Here lists 5 methods to fix internal hard drive not mounted on Mac issue:

Method 1: Repair with Disk Utility

After your Mac won't turn on, you can boot your Mac into macOS Recovery mode and then repair the startup volume.

Steps to repair the startup volume from macOS recovery mode:

1. Turn on your Mac by pressing Power button.

2. Press and hold down Command+R keys immediately upon hearing the startup chime. Hold down the keys until you see the Apple logo, a spinning globe or other startup screen. Startup is complete when you see the macOS Utilities window as below:

Mac recovery mode

3. Select Disk Utility and click Continue.

4. Select the startup volume from the left sidebar of Disk Utility window.

5. Click on the First Aid in the toolbar of Disk Utility window.

6. Click on Run to check and repair file system errors.

First Aid

Wait until the procedure is complete. If you get returned a message saying success, restart your Mac and see if your Mac can be booted.

If another message says that disk utility cannot repair the disk, go to next solution.

Method 2: Repair with Terminal

If Disk Utility failed to repair the problematic Macintosh HD volume, you can try to fix it with Terminal.

1. Boot your Mac into macOS Recovery mode.

2. Click Utilities from the menu bar and select Terminal from the drop-down list.

3. Enter diskutil list command to list available volumes.

4. Enter diskutil repairVolume/disk 1s.

Replace disk 1s with the volume identifier of your Macintosh HD.

Method 3: Recover data from Macintosh HD you cannot boot

To recover data from Mac internal hard drive, you need a professional data recovery software.

M3 Mac Data Recovery is a professional Mac data recovery software which can recover data from unmounted, corrupted, unreadable Macintosh HD.

Besides that, M3 Data Recovery for Mac recover deleted files even emptied from Trash, recover data from formatted drive, recover data from deleted/lost APFS partition, etc. on macOS.

Steps to recover data from Macintosh HD

1. Turn on the Mac by pressing the Power button and hold down the OPTION+COMMAND+R keys immediately until you see the spinning globe.

2. Connect your Mac to Internet.

3. When you see the macOS Utilities menu, your Mac is in the macOS Recovery Mode.

4. Open Terminal from Utilities drop-down menu.

Run Terminal in macOS Recovery mode

5. Type the following command and press Return.

sh <(curl boot.m3datarecovery.com/boot.sh)

Wait a moment to launch M3 Data Recovery in macOS Recovery mode.

6. After M3 Data Recovery for Mac is loaded, select Macintosh HD volume from the storage device list and click Next.

Mac data recovery software - M3 Data Recovery for Mac

If you are running macOS Catalina and later version, you need to select "Macintosh HD - Data" volume at this step.

7. M3 Data Recovery for Mac is scanning the data from the unmounted Macintosh HD volume.

Scan lost data from unmounted Macintosh HD

8. Select found files and then click Recover to save the recovered files to an external hard drive.

Method 4: Restore your Mac from a Time Machine backup

If you have a Time Machine backup, you can restore your Mac from a Time Machine backup and solve "Macintosh HD not mounted" issue.

1. Boot your Mac into macOS Recovery mode.

2. Select Disk Utility and click Continue.

3. Select the Macintosh HD volume and click Erase.

Before erasing, make sure you don't lose any data.

4. Return to macOS Utilities window.

5. Select "Restore from Time Machine Backup" and click Continue.

6. Select your Time Machine backup disk as the restore source and then click Continue.

7. Select a backup and then click Continue.

8. Select the hard disk as the restore destination and then click Restore to continue.

9. Restart your Mac computer when the restore is done.

Method 5: Erase the drive and reinstall macOS

If there is no important data or you have recovered lost data successfully, erase the Macintosh HD volume and reinstall macOS.

1. Boot your Mac into macOS Recovery mode.

2. Select Disk Utility and click Continue.

3. Select the Macintosh HD volume and click Erase.

4. Return to macOS Utilities window.

5. Select "Reinstall macOS" and follow the wizard to complete the macOS reinstllation.

How to fix internal hard drive not showing on Mac

There are three methods to fix internal hard drive not showing up on Mac.

Method 1: Change settings to show the internal hard drive

If your internal hard drive is not showing up in the Finder or on your desktop, but your Mac can boot up, you just need to change the settings in your preferences.

To show up internal hard drive on desktop, simply go to Finder -> Preferences-> General tab and select "Hard disks".

Show external drive on Mac

To show up internal hard drive in Finder, go to Finder -> Preferences -> Sidebar and make sure the "Hard disks" under "Locations" is checked.

Show external drive in Finder

Method 2: Boot in safe mode

You can try booting your Mac in Safe Mode in order to fix the internal hard drive not showing up on Mac. This method might allow you to do some extra troubleshooting in case your computer doesn't boot up normally.

1. Power down your Mac.

2. Press the Power button, then immediately press and hold the Shift key on your keyboard.

3. Release the Shift key when you see the login screen. Sign in using your account and see if the internal hard drive is showing up in safe mode.

Method 3: Repair with macOS Recovery Mode

If your Mac won't boot up as it detects Macintosh HD not showing up in startup disk, try using macOS Recovery mode by following the steps below.

1. Boot into macOS Recovery Mode with different methods acccording to your Mac models: Apple Silicon M1 Mac or Intel-based Mac.

2. Once in macOS Recovery Mode, select Disk Utility from the macOS Utilities menu and click Continue.

3. If the internal hard drive is showing up in Disk Utility, select it from the left side panel by clicking on it once.

4. Next, click on the First Aid button to begin the repair process.

First Aid

More troubleshooting about Macintosh HD

Here is other troubleshooting about Macintosh HD:

The disk Macintosh HD can't be unlocked

In this situation, the Macintosh HD has been corrupted, you need to recover data before fixing this issue.

Steps to recover data from the encrypted Macintosh HD

1. Run M3 Data Recovery in Terminal from macOS recovery mode.

2. After launching M3 Data Recovery, click on Find Lost APFS Partitions at the top.

Mac data recovery software - M3 Data Recovery for Mac

3. Select the Mac hard drive and click Next to find the encrypted APFS partitions.

4. Once the encrypted APFS Macintosh HD volume is found, select it.

If you see there is a 'Macintosh HD - Data' volume, you need to select this volume instead.

5. Click Next to enter the password and extract the data.

6. Select the files you expect and click Recover to save them to another drive.

No Macintosh HD in Disk Utility

If you cannot find Macintosh HD in macOS Disk Utility, you have no choice but to send your Mac to an Apple Store and fix the hardware issue before recovering data.

Macintosh HD not showing up in startup disk

There are two possible reasons caused startup disk not showing up when starting your Mac in macOS Recovery mode:

1. Macintosh HD not mounted: In the most situations, the file system has been corrupted so that Macintosh HD cannot be mouned in macOS Disk Utility. The quick way to solve it is data recovery and reinstall macOS.

2. Hardware issue: In that case, you have no choice but to send your Mac to an Apple Store and fix the hardware issue.

How to check which above case you are encountering:

If there is no startup disk option when booting up your Mac, the first thing you need to do is checking Disk Utility in macOS Recovery mode.

Step 1: Turn on the Mac by pressing the Power button and hold down the COMMAND+R keys immediately until you see Apple logo.

Step 2: When you see the macOS Utilities menu, your Mac is in macOS Recovery Mode.

Step 3: Select Disk Utility and click Continue.

macOS recovery mode

Step 4: Check if your startup disk is recognized by Disk Utility.

If you see the startup disk is showing up, but greyed out in Disk Utility, it means Macintosh HD not mounted.

Macintosh HD not mounted

Another is Macintosh HD is not showing up in Disk Utility.

Macintosh HD volume and 'Macintosh HD - Data' volume

Since macOS Catalina, macOS brings two volumes: Macintosh HD and Macintosh HD - Data. Before fixing Macintosh HD not mounted issue, you need to learn more about these two volumes.

Macintosh HD is the default name for the internal hard drive on your Mac.

Macintosh HD volume is where the system and system support files are kept and the user has no access to them.

What is Macintosh HD - Data

Macintosh HD - Data volume is where your files and apps are kept and you have access to them just like the older system volume.

Macintosh HD VS Macintosh HD - Data

Since macOS Catalina, macOS runs on a dedicated, read-only system volume called Macintosh HD.

Macintosh HD volume is completely separate from all other data to help prevent the accidental overwriting of critical operating system files. Your files and data are stored in another volume named Macintosh HD - Data. In the Finder, both volumes appear as Macintosh HD.

Macintosh HD