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Apple took system protection to the next level in macOS 10.15 Catalina by splitting your normal boot volume into two pieces. It appears like a single volume on the Desktop, but it’s really two.
In most cases, macOS Catalina cannot be installed on Macintosh HD, because it doesn't have enough disk space. If you install Catalina on top of your current operating system, the computer will keep all the files and still need free space for Catalina. So the easiest fix would be to clean up your system with CleanMyMac X before upgrading. 'Macintosh HD' is Read Only - MacOS Catalina 10.15 'Macintosh HD' is Read Only - MacOS Catalina 10.15 HaydenMeade. Community Beginner, Jun 28, 2019. Copy link to clipboard. I've been having an issue when opening Lightroom CC. I have tried several solutions for. To download the macOS Catalina installer click on this link to be taken to the Catalina page on the Mac App Store. Click on Get to download the installer. Software Update will search and then, if. Apple took system protection to the next level in macOS 10.15 Catalina by splitting your normal boot volume into two pieces. It appears like a single volume on the Desktop, but it’s really two.
Summary: Unable to mount Macintosh HD in Disk Utility in macOS High Sierra/Mojave/Catalina? Cannot access the data stored on the Mac hard drive? Don't worry. This article will show you 7 efficient solutions to fix Macintosh HD not mounted/showing up in Disk Utility in macOS Catalina/Mojave/High Sierra issue without losing data.
Mounting a hard drive on Mac means to make the drive available for the operating system, which requires a mount point to read and write this hard drive. If the internal hard drive of Mac, the disk0s2, or the Macintosh HD is not mounted on Mac, you'll see one of these:
- All the data on the Mac hard drive becomes inaccessible.
- Most of the operations in Disk Utility are greyed out or disabled except the Erase button.
- The Macintosh HD will be grayed out, and you cannot repair it but only back up files.
- No Macintosh HD showing up in Disk Utility.
- Mac computer stops working, or your Mac won't turn on at all.
- An error message like 'com.apple.DiskManagement.disenter error' appears.
Catalina Macintosh Hd Data
In fact, Macintosh HD - Data (in macOS Catalina and macOS Big Sur) or Macintosh HD not mounted problem is quite common on Apple computers. If you have met the same situation above, what can you do to fix the problem without worrying about data loss? Now, read on to learn the solutions.
Why does Macintosh HD not mounted/showing in Disk Utility?
The volume Macintosh HD is found corrupt and needs to be repaired before mounting for those 5 primary reasons.
- File 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.
- Virus 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.
- Catalog 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.
- Disk Utility failures The Macintosh HD not mounted issue may be caused by Disk Utility faults, too.
- System malfunctions. System malfunctions include machine malfunctions and operating system errors. If the Mac operating system crashes, it cannot mount any drive.
Unmountable Macintosh HD Data Recovery
Note: Before fixing the Macintosh HD not showing up in Disk Utility issue, please stop using the Mac computer and make sure you have a backup copy of the Mac hard drive.
That's because, your any further operation on the Mac computer, including troubleshooting the hard drive not mounting errors, may write new data to the unmounted Mac hard drive and overwrite the original data. Without backups, you need to recover lost data from crashed/dead Mac hard disk or use Target Disk Mode
Method 1: Recover lost data from unmountable Macintosh HD with iBoysoft Data Recovery for Mac
iBoysoft Data Recovery for Mac is free Mac hard drive data recovery software which helps yourecover lost data from the unmountable Macintosh HD. It also helps retrieve files from corrupted Mac hard drive when there is a boot issue, and 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/High Sierra 10.13/10.12 and OS X 10.11/10.10/10.9/10.8/10.7. It supports Mac photo recovery as well as documents, videos, audio files and emails recovery.
Within three steps - select, scan and recover, you can get all lost data back. Moreover, it also provide with powerful preview features and different filtering functions. After scanning, it allows you to preview all recoverable files no matter what file types you have lost, including documents, photos, videos, music files, emails, etc. The filtering and sorting functions enable you to quickly target the right content from a mass of scanning results.
Tutorial to recover data from the unbootable Macintosh HD
Though it's unbootable, you can still rescue your data by running iBoysoft Data Recovery for Mac in Recovery Mode. You can also refer to this tutorial: How to run iBoysoft Data Recovery for Mac through iBoysoft Server. This method is highly recommended because it is a lot easier and time-saving.
Note: Before you follow the steps below, you have to 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. You need to make your Mac connected to the Internet all the time.
- 3. Go to Utilities > Terminal from the menu bar.
- 4. Run the following command:
- This will launch iBoysoft Data Recovery for Mac through iBoysoft Server.
- 5. After launching iBoysoft Data Recovery for Mac, please select the Mac hard drive, usually Macintosh HD, and click Scan button.
- 6. Preview the scanning results and choose the files you want to get back.
- 7. Click Recover button. Here please select a different location to store the recovered files.
Method 2: Use Target Disk Mode
Target disk mode is a boot mode which allows you to browse and transfer files to and from a Mac internal hard drive without booting macOS. It can be used for troubleshooting the internal hard drive not showing up on Mac.
• How to transfer files to and from a Mac with Target Disk Mode?
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 follow the solutions to fix the issue.
Solution 1: Restart your Mac computer
No matter what happens to your Mac computer and makes your Macintosh HD unmounted, the first and foremost solution is to shut down your Mac computer and restart it up again. 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.
Solution 2: Repair the unmountable Macintosh HD in Recovery Mode
If the Macintosh HD is unable to be mounted in Disk Utility normally, 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 3: 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 4: 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 5: Try 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 6: 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. Thereby 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 7: 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 as above.
- 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.
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.
Final thoughts
Macos Catalina Macintosh Hd Data
It's so frustrating that Macintosh HD greyed out in Disk Utility in Recovery Mode, especially when you have important data stored on the Mac. But the good news is that quite a few feasible solutions are available to fix this issue. Before that, if you care about data on the Macintosh HD, you should recover lost data from the unmountable Macintosh HD with iBoysoft Data Recovery for Mac. Download and install this free Mac data recovery software, you won't be bothered by any data loss scenarios.
Read Content Hub for: hard drives not showing up/mounting issues
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.
If you have applied the macOS Catalina upgrade, you may have noticed a new volume on your Mac, 'Macintosh HD - Data'. This new volume is part of a volume group, which is a new concept in macOS Catalina. We discuss volume groups in detail here, but the remainder of this article aims to answer your questions about how CCC handles this new volume structure and what you have to do, if anything, to adjust your backups for macOS Catalina.
Maybe. If you are making a simple backup of your startup disk to a dedicated backup disk, then no, you do not have to make any changes to the destination unless CCC specifically recommends it. CCC will automatically make the changes required for your destination to be a bootable backup of macOS Catalina. Iclouder v1 0 beta 7z password. If your destination volume is encrypted, however, see the question later in this document for information specific to encrypted destinations.
If you have multiple tasks that back up to the same destination, however, then now is a good time to revisit your backup 'hygiene'. Ideally, each source that you back up will have a dedicated volume on the destination. This is particularly important when one of the sources is a Catalina startup disk. See this section of CCC's documentation for guidance on how to configure your destination device to accommodate backups of multiple source volumes:
I want to back up multiple Macs or source volumes to the same hard drive
Video: Preparing your backup disk on macOS Catalina
Video: Preparing your backup disk on macOS Catalina
No. When you select your startup disk (e.g. Macintosh HD) as the source for your backup task, CCC will automatically back up both volumes in that volume group.
Many external hard drives are shipped with a Windows-centric format and partitioning scheme. That partitioning scheme can't accommodate Apple's APFS filesystem, so before you can use your backup disk for making a bootable backup of your Catalina startup disk, you must make sure that it is partitioned with the correct partitioning scheme. This section of CCC's documentation walks you through the steps for configuring your backup disk:
Disk Utility's interface for performing this simple task is surprisingly unintuitive, so here is a summary of the process with some emphasis on the steps where people often go awry:
- Open Disk Utility
- Choose Show all devices from Disk Utility's View menu. This is a very important step!
- Choose the parent device of your destination volume in the sidebar – don't click on the backup volume itself, click on its parent device. If you don't click on the parent device, you won't be able to change the partition scheme.
- Click on the Erase button in the toolbar. Don't click on the Partition button! That would seem like the obvious choice, but you cannot actually change the partitioning scheme in the Partition interface.
- Set the Scheme to GUID Partition Map and the Format to APFS, then click the Erase button.
If you're still having trouble correcting the partition scheme, you may find this video demonstration helpful.
Because macOS Catalina leverages volume groups for the startup volume, creating a bootable backup requires an APFS formatted destination volume. HFS+ is no longer an option for booting macOS starting with macOS Catalina. For your convenience, CCC will automatically convert your HFS+ formatted backup volume to APFS as necessary and create a volume group on the destination. This conversion is the same conversion that took place on your startup disk when you upgraded to High Sierra or Mojave, with one notable exception: CCC tells you that it's going to convert the destination, and gives you the opportunity to decline the conversion. The conversion is non-destructive — any data that you have on the destination volume will remain in place, the only thing that changes is the format of the volume.
Typically there is no reason to decline the conversion. The conversion is non-destructive, and it's required for making a backup of the system. If your backup volume is dedicated to your CCC backup task, then converting the destination to APFS is the right choice.
However, if your destination volume is not dedicated to your CCC backup task or if you're not intending to back up the macOS System files, you should consider how the other uses of your destination might be affected by the conversion. For example, Time Machine is not currently compatible with APFS as a destination, so converting a destination volume that contains a Time Machine backup would break the Time Machine backup. CCC specifically avoids converting Time Machine backup volumes. Another example – if you're only backing up a single folder or handful of folders from your startup disk, you should configure a folder-to-folder backup instead, which won't require any conversion of the destination.
You should also avoid the conversion if your destination device is a slower 2.5' rotational HDD, i.e. with a rotational speed of 5400RPM (or slower!). APFS does not perform well on HDD devices, and that performance is unacceptable on these slowest HDD devices due to their much slower seek performance. Keep these slower disks formatted as Mac OS Extended, Journaled. These devices are suitable for button in the toolbar
If your destination volume is not APFS formatted, and you cannot or prefer to not convert the volume to APFS, you can create a dedicated partition on your destination disk for CCC to use. To create the partition:
- Open Disk Utility
- Select your destination disk in Disk Utility's sidebar
- Click the Partition button in the toolbar
- Click the '+' button to add a partition to the disk
- Set the name and size of the partition to your preference
- Choose APFS as the format
- Click the Apply button
If you were keeping other data at the root level of your backup disk that isn't on your startup disk, then that data is still on your backup disk, but it will be harder to find in the Finder due to the volume group changes that are applied for a backup of the Catalina startup disk. If your backup disk is named 'CCC Backup', right-click on the 'CCC Backup - Data' volume in CCC's sidebar and select Reveal in Finder to reveal that content.
It depends on how much data you have on your destination volume, the performance of the destination device, and the degree to which the destination volume is fragmented. It can take a while, but CCC won't wait for more than two hours for the conversion to complete. If it's taking longer than two hours, then CCC will recommend that you erase the destination volume instead, which will resolve any performance issues that are directly caused by filesystem fragmentation. If CCC issues this recommendation and you prefer to wait out the conversion rather than erase the volume, you're welcome to convert the volume in Disk Utility instead (the option is in the Edit Menu).
Unfortunately that is not possible due to a macOS limitation, Disk Utility cannot add an encrypted volume to an APFS volume group. When you select a Catalina+ startup disk as a source and an encrypted volume as a destination, CCC will disallow the selection and suggest that you erase or decrypt the destination volume.
Fastest and easiest solution: Erase the destination as APFS (not encrypted)
Erasing the destination volume is the simplest and fastest way to resume your Catalina backups, and you can find detailed instructions for doing that here: Preparing a hard drive for use with Carbon Copy Cloner.
After you have run your backup task to a non-encrypted volume, you can then boot from the backup and re-enable FileVault in the Security & Privacy Preference Pane.
Related Documentation
Decrypting the destination volume will take considerably more time (possibly days) and effort, but you can decrypt the destination volume with one of the following methods:
A: Boot from the backup volume, open the Security Preference Pane, disable FileVault
B: Decrypt the volume in the Terminal application. E.g. for an HFS+ formatted destination:
diskutil cs decryptVolume '/Volumes/CCC Backup'
Or for an APFS-formatted destination, get a list of user IDs associated with the encrypted volume, then use one of the 'Local Open Directory User' UUIDs from the output of the first command with the second command:
diskutil ap listUsers '/Volumes/CCC Backup'
diskutil ap decryptVolume '/Volumes/CCC Backup' -user B44348A3-68DF-4B7B-800D-47FE38711178
Replace 'B44348A3-68DF-4B7B-800D-47FE38711178' with a UUID produced by the first command.
Macos Catalina Iso
Wait for decryption to complete
You'll have to wait for the decryption process to complete before you proceed with your backup task. Decryption will continue in the background while you're booted from your production startup disk. macOS doesn't offer a convenient method to see conversion progress, but you can type diskutil apfs list (or diskutil cs list if the applicable volume is HFS+ formatted) in the Terminal application to see conversion progress.
Download Full Installer Macos Catalina
Re-enabling FileVault on your Catalina backup volume
After you have run your backup task to a non-encrypted volume, you can then boot from the backup and re-enable FileVault in the Security & Privacy Preference Pane.
Related Documentation
No, this is a one-time task that is required for CCC to be able to make adjustments to the destination volume that are required for macOS Catalina. Once you have established a Catalina backup, you can reenable FileVault and your future backups will work without any additional intervention.
Macos 10.15 Catalina Download Link
If you are willing to forgo the creation of a bootable backup of your macOS Catalina startup disk, you can configure your backup task to back up only the Data volume of your startup disk:
- Open CCC and click the Show Sidebar button in CCC's toolbar if it is not already visible
- Select your backup task in the sidebar
- Drag the Macintosh HD - Data volume from CCC's sidebar into the Source selector
- Save the task
With this configuration, CCC will not impose any requirements on the format or encrypted nature of the destination volume. Because this destination will not be bootable, we recommend that you remove any existing System folders from the destination volume to avoid any ambiguity about the functionality that this volume provides.
Mac Os Catalina Macintosh Hd Data
If your backup disk is a 'mobile' 2.5' rotational disk (i.e. that spins at 5400RPM or less), we recommend that you format that device as 'Mac OS Extended, Journaled' (aka HFS+) and use it for, for example, you would do the following:
- Open Disk Utility
- Choose Show all devices from the View menu
- Select the CCC Backup volume in the sidebar — this is the System volume in the group.
- Click the -- button in the toolbar to delete that volume
- Select the CCC Backup - Data volume
- Click the Unmount button in the toolbar
- Click the Mount button in the toolbar to remount that volume
- Change the name of the volume back to CCC Backup
You won't find a legacy _CCC SafetyNet folder on the destination if snapshot support is enabled on that volume. Instead, select the destination Data volume in CCC's sidebar to see a list of SafetyNet snapshots.
If snapshot support is not enabled on your destination volume, then the SafetyNet folder can be difficult to navigate to in the Finder. It's still located at the root level of your destination's Data volume, but the Data volume is hidden by default in the Finder. To reveal it in the Finder, click on CCC's Destination selector and choose the Reveal Data Volume option.
If you have ever restored content back to your production startup disk while booted from a CCC backup, then there may have been a _CCC SafetyNet folder placed at the root of that volume. When you upgrade to Catalina, the macOS installer will relocate any content that is at the root of the startup disk to Users > Shared > Relocated Items > Security. You will also find a PDF in that folder explaining why the content was moved there. In short, the content was moved there because it is very difficult to find content at the root level of the Data volume of your startup disk on macOS Catalina.
Mac Os Catalina Macintosh Hdmi
If you attempt to delete that SafetyNet folder (and you certainly may delete that folder), the Finder may claim — falsely — that the folder cannot be deleted because some items are in use. In fact, nothing in that folder is in use, but some of the older system items may be protected by System Integrity Protection. You can learn how to dispose of this content in this section of CCC's documentation: