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When the Macintosh HD is not mounted in Disk Utility, it means that the drive is not available for the operating system. macOS can't find a mount point to read and write the Macintosh HD. Then, your Mac won't turn on.
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If the internal hard drive of Mac, the disk0s2, or the Macintosh HD is not mounted on Mac, you'll see one of these in macOS Recovery mode:
- When selecting the Macintosh HD in Disk Utility, the operations are greyed out except the Erase button.
- The Macintosh HD is greyed out, and you cannot access files on it.
- Macintosh HD not showing up in Disk Utility at all.
- Macintosh HD not showing up in the startup disk.
- Mac can't find the startup disk.
- Disk not showing up when reinstalling macOS
- Click the Mount button in Disk Utility but see an error message like 'com.apple.DiskManagement.disenter error'.
If you have met this issue, read this post carefully to recover data from Mac internal hard drive and fix the Macintosh HD not mounted problem.
- 1. Recover data from Macintosh HD not mounted (Don't ignore)
Unmountable Macintosh HD Data Recovery
Note: Before fixing the Macintosh HD not showing up in Disk Utility issue, please stop using the Mac and make sure you have a backup of the Mac hard drive or have recovered data from it.
That's because your any further troubleshoot the hard drive not mounting errors, may write new data to the unmounted Mac hard drive and overwrite the original data. Consequently, you'll face permanent data loss.
Without backups, you need to do Macintosh hard drive recovery to recover lost files.
Recover data from unmountable Macintosh HD with iBoysoft Data Recovery for Mac
Watch this video to quickly get how to recover data from Mac that won't boot due to the unmounted Macintosh HD. Don't hesitate, or you'll miss the chance to rescue your files.
iBoysoft Mac Data Recovery is free Mac hard drive data recovery software which helps you recover lost data from the inaccessible or unmountable Macintosh HD.
It also helps recover data from T2-secured Mac , like MacBook Pro, MacBook Air, iMac introduced in and after 2018. It is fully compatible with macOS Big Sur 11/Catalina 10.15/Mojave 10.14 and previous OS versions.
Tutorial to recover data from Macintosh HD that not mounted
Though it's unbootable, you can still rescue your data by running iBoysoft Data Recovery for Mac in macOS Recovery Mode. This method is highly recommended because it is a lot easier and time-saving.
Note: Before you follow the steps below, make sure your Mac has Internet connection.
- 1. Restart your Mac and immediately hold down COMMAND+OPTION+R keys at startup.
- 2. Choose a network for your Mac and keep your Mac being connected to the Internet all the time.
- 3. Select Utilities > Terminal from the menu bar.
- 4. Run the following command:
- This will launch iBoysoft Data Recovery for Mac through iBoysoft Server.
Then, select the Mac hard drive, usually Macintosh HD to scan, preview, and recover files from it.
How to fix Macintosh HD not mounted in Disk Utility?
After recovering data from the Mac hard drive that is not mounted in Disk Utility, you can try the first and foremost solution: shut down your Mac and restart it up again.
To do this, simply holding down the on/off key until the computer turns off, waiting a few minutes, and then turning it back on.
Sometimes when you turn it back on, everything returns to normal. If not, try the following solutions.
Solution 1: Repair the unmountable Macintosh HD in Recovery Mode
When the Macintosh HD is unable to be mounted in Disk Utility normally, it also not showing up on Mac. You can try to repair it with Disk Utility's First Aid in Recovery Mode.
- 1. Boot your Mac into Recovery Mode. Start your Mac and hold down the Command and R keys simultaneously until you see an Apple logo or spinning globe. Then release the keys.
- 2. Select Disk Utility from the macOS Utilities menu and click Continue.
- 3. Select the unmounted Macintosh HD from the left-hand panel.
- 4. Click First Aid on the top of the window and wait while it verifying and repairing errors.
Solution 2: Fix Macintosh HD not mounted by Terminal
If Disk Utility stopped repairing Macintosh HD in macOS, you can then try to fix it with Terminal.
- 1. Boot your Mac into Recovery Mode.
- 2. Click Utilities from the menu bar and select Terminal from the drop-down list.
- 3. Enter diskutil list. This will list out the available volumes.
- 4. Check the volume identifier from the table that appears. (For example disk 2s1)
- 5. Enter diskutil repairVolume/disk 2s1. (Replace disk 2s1 with the volume identifier of your Macintosh HD)
Solution 3: Run FSCK command in Single User Mode
FSCK is a command-line tool to check the consistency of a hard drive and repair disk errors. If the solutions above are unable to fix Macintosh HD or the Mac internal hard drive not mounted issue, you can have a try.
- 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.
- 2. Type in:
- 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'.
- 4. Type in the command to restart your Mac:
Solution 4: Fix the unmountable Macintosh HD in Safe Mode
When trying to boot into Safe Mode, macOS will scan and repair any errors it finds on the disk.
To boot into Safe Mode, you need to shut the Mac down and start it up while holding down Shift. Release the Shift key when you see the login window. Should your computer boot properly, try restarting and booting as normal.
Solution 5: Reset NVRAM on your Mac
NVRAM is a small amount of memory used to store certain settings for quick access on Mac. The corrupted NVRAM can cause Mac glitches or even prevent macOS from starting.
So, if your Mac computer won't boot properly, you can attempt to reset the NVRAM. Reboot your Mac and hold down the 'Command + Option + P + R' key buttons. After resetting, you can retry to mount the Macintosh HD on Mac.
Solution 6: Erase the unmountable Macintosh HD and reinstall macOS
If the Macintosh HD won't mount, and your Mac still cannot recognize the Mac internal hard drive, the final chance is to factory reset the Mac - format the Macintosh HD and reinstall macOS on it. But as you know, reformatting will erase all the data stored on the Macintosh HD. Please make sure you have recovered data with iBoysoft Data Recovery for Mac.
- 1. Boot your Mac to Recovery Mode.
- 2. Select Disk Utility from the macOS Utilities menu.
- 3. Select the unmountable Macintosh HD from the side bar.
- 4. Click Erase from the top.
- 5. Setup the required information (i.e. Name, Scheme, Format, etc.) to reformat the disk and click Done when finished.
- 6. Go back to macOS Utilities screen and select Reinstall macOS.
Solution 7:Send your Mac for repair
After macOS reinstallation, your Macintosh HD still greyed out in Disk Utility or not showing up on Mac. Or you have encountered the worst case: finding that no Macintosh HD shows up in Disk Utility.
As there's no startup disk in Disk Utility when you boot into macOS Recovery mode, it means that your Mac cannot find the boot loader. Your Mac hard drive either dead or not properly connected.
In this case, a professional hardware repair is necessary. You can send it to an Apple Repair Center.
What to keep in mind: Once you encountered the Macintosh HD not mounted error, the first thing you should do is to save your data on the Mac hard drive. Without regular backups, a data recovery program like iBoysoft Data Recovery for Mac will help you recover lost data from the unmounted Mac hard drive. Then, try to fix the Macintosh HD not mounted issue.
How to fix the error: The disk 'Macintosh HD' can't be unlocked
Sometimes, the Macintosh HD is not mounted because it can't be unlocked. Usually, after a macOS Big Sur upgrading or macOS downgrading, you log into your Mac but see the following error messages as below on your desktop:
The disk 'Macintosh HD' can't be unlocked.
What's wrong? It indicates your Macintosh HD volume may have some problems. To fix this error, you need to back up your Mac. Then, erase the Macintosh HD and reinstall macOS in macOS Recovery mode.
Or sometimes, you see an error message like this: The Disk 'Macintosh HD – Data' can't be unlocked.
It usually caused by the double identical Macintosh HD - Data volumes on your Mac. You'll find two kinds of volume lists like the following forms in Disk Utility:
- Macintosh HD
- Macintosh HD – Data
- Macintosh HD – Data – Data
or:
- Macintosh HD
- Macintosh HD – Data
- Macintosh HD – Data
The common way to fix this issue is easy. First, back up the redundant Macintosh HD - Data volume with Time Machine.
Note: The redundant volume usually the Macintosh HD - Data - Data volume. Or, it's the second or unmounted Macintosh HD - Data volume on the left sidebar in Disk Utility.
Then, delete it with the following steps:
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- Boot into macOS Recovery mode.
- Select Disk Utility. Then, right-click the redundant Macintosh HD - Data volume.
- Choose Delete APFS Volume.
Then, restart your Mac, you'll find the error message - 'Macintosh HD - Data can't be unlocked' doesn't appear anymore. Next, you can recover data from Time Machine backup.
Why does Macintosh HD not mounted/showing in Disk Utility?
Curious about why the internal hard drive not mounting on Mac? Here are the possible reasons.
The volume Macintosh HD, which is not mounted (greyed out) or not showing up in Disk Utility, is found corrupt and needs to be repaired before mounting for those 5 primary reasons.
- 1File system damage
- File system is responsible for how data is organized and stored in a drive. If the file system of the Macintosh HD is corrupted, the master file table will be impacted in a direct manner so the Mac won't mount the drive.
- 2Catalog file corruption
- Catalog files contains the record files of partitioned volumes. So if any catalog file becomes corrupt, the Mac won't be able to get volume size location, description of volume content and other volume information, let alone mount the drive.
- 3Disk Utility failures
- The Macintosh HD not mounted issue may be caused by Disk Utility faults, too.
- 4System malfunctions
- System malfunctions include machine malfunctions and operating system errors. If the Mac operating system crashes, it cannot mount any drive.
- 5Virus attacks
- Perhaps, your Mac system or the Macintosh HD is attacked by virus or malware, resulting in data corruption. Then your Mac won't mount the Macintosh HD, neither.
Footnote: Macintosh HD vs. Macintosh HD - Data
You may find that there are two volumes in Disk Utility: Macintosh HD and Macintosh HD - Data. In macOS Catalina, the startup disk is segregated into two separate entities—Macintosh HD and Macintosh HD - Data.
So, what are the differences between Macintosh HD and Macintosh HD - Data? Here are the answers.
What is Macintosh HD?
Macintosh HD is the read-only system volume on macOS Catalina. This volume only stores the operating system files. Users can't erase, delete, or edit this system volume.
What is Macintosh HD - Data?
Macintosh HD stores the Mac user data, like documents, videos, photos. This volume is read-write support. Mac users can edit and manage files on Macintosh HD - Data.
In the Finder, both the two volumes show up as Macintosh HD.
Final thoughts
Macintosh HD not mounted in Disk Utility or even no Macintosh HD in Disk Utility is a common issue in daily life. This post draws the most efficient ways to help you fix this problem.
By the way, data loss is inevitable if encounter internal hard drive not mounting on Mac. So, retrieve data with iBoysoft Data Recovery for Mac in macOS Recovery mode is necessary.
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Which solution helps you the most? Do you have any other solutions to fix Macintosh HD not mounted issue or have any question? Please don't hesitate to email us.
