The Disk Utility on Mac is a very useful system tool for fixing specific disk problems. For example, you can run a disk check when your apps quit simultaneously, an external drive is not working properly, or your Mac won’t startup. Disk Utility will check the health of your hard drive and repair any disk errors if possible.
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Disk Utility usually works smoothly, but there are times when frustrating errors occur and prevent the process from being completed. One of the common errors encountered when using Disk Utility is the “Couldn’t Unmount Disk” error. When this error pops up, any attempted task gets stopped right in its tracks.
Open Disk Utility on the Mac if you have not done so already Click on “View” in the toolbar Choose “Show All Devices” See the list of disk devices in the sidebar of Disk Utility. Check if your SD card shows up in Disk Utility. If you still see the SD card not showing up in Disk Utility, another option is to restart your Mac. A simple restart often can fix this problem. However, if both solutions fail to show up your SD card in the Disk Utility, you can try to connect it to a Windows PC.
What is the “Couldn’t Unmount Disk” Error on Mac?
The “Couldn’t Unmount Disk” error can happen during formatting, partitioning, disk verification and repair, or any task that the Disk Utility undertakes. What makes this error frustrating is that there is usually very little to no additional information provided by the error message, making it more challenging to resolve the problem, And based on the error message, it is even harder to determine what the problem is all about.
Here are some variations of the error message that Mac users encounter, depending on the process being executed when the error happened:
- Disk Erase failed.
Disk Erase failed with the error:
Couldn’t Unmount Disk. - Partition failed
Partition failed with the error:
Couldn’t Unmount Disk. - Disk Utility stopped verifying (letter of the hard disk)
Couldn’t Unmount Disk. - Volume Erase failed
Volume Erase failed with the error:
“Couldn’t Unmount Disk”.
Once this pops up, the current process gets halted and could no longer proceed, affecting any troubleshooting process or disk repair you might be doing.
What Causes the “Couldn’t Unmount Disk” Error in Disk Utility for Mac?
When your Mac is getting the “Couldn’t Unmount Disk” error when using the Disk Utility, it is possible that the boot drive cannot be modified because it is being used by some process or an application. For example, a file from the disk you are trying to erase could be open, which means that you can’t proceed with the erasing unless all the files are closed.
Another possible reason is the presence of malware. When a malicious software is running in the background and wreaking havoc on your Mac, you might get the “Couldn’t Unmount Disk” error when you try to do something with your hard drive. This is because the malware might be making changes to your hard drive without you knowing it.
Other factors you should look into include corrupted system files, bad hard drive sectors, or insufficient permissions. Whatever the reason is, resolving this “Couldn’t Unmount Disk” error should be your priority because it might lead to further disk damage or other hard drive issues.
How to Fix the “Couldn’t Unmount Disk” Error on Mac
If your Mac is getting the “Couldn’t Unmount Disk” error, don’t worry because there are several ways to handle this problem. But before you do so, here are some of the basic troubleshooting you should take care of first:
- Close all applications and files before attempting the repair.
- Make sure you have enough permissions to read and write to the drive you want to modify.
- Run a scan to check for the presence of malware. Delete any malicious software detected using your antivirus and delete all related files.
- Disable your security software after running the scan because it might prevent the processes from pushing through.
- Declutter your system by cleaning up your computer with a Mac cleaning tool. This should fix any errors related to corrupted junk files or cached data on your Mac.
- Restart your computer.
Once you’ve completed the steps above, you can now proceed with the main solutions:
Solution #1: Use a USB Boot Drive to Repair the Hard Drive.
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If “Couldn’t Unmount Disk” error occurs when you are trying to modify the boot drive, the easiest solution is to boot your Mac using another drive, and then run Disk Utility from that disk. You can use an installation drive or a recovery drive, as long as it is bootable and it is separate from the primary boot disk where your macOS is installed.
Here are the steps you need to follow to resolve this error using a USB boot drive:
- Connect the USB boot drive to your Mac, then reboot.
- While restarting, hold down the Option key button and choose the attached boot drive.
- In the boot menu, choose Disk Utility.
- Click First Aid at the top menu to verify the disk.
- Once your disk has been verified, you can then proceed with the task you were trying to perform when the error occurred.
Solution #2: Use the Recovery Partition.
If the “Couldn’t Unmount Disk” error message appears when doing First Aid on your disk or formatting a non-boot disk, the first solution will not work. If this is the case, you can try resolving the error using Recovery Partition.
Where Do I Find Disk Utility On My Macbook Pro
Mojave mac mini mid 2011. Here’s how to do it:
- Reboot your Mac.
- While booting up, hold down the Option key to boot using the Recovery Partition.
- Next, click on Disk Utility from the boot menu.
- Click First Aid to verify the disk or select Erase to format the disk if needed.
Keep in mind that this method will only work if the disk that is throwing the error is not the same as the primary boot partition where the Recovery Partition is saved.
Solution #3: Use Command Prompt to Force Unmount the Disk.
If the above methods don’t work and your disk is pretty stubborn, you can attempt to fix this error by forcing to unmount the disk using commands.
To do this, follow the steps below:
- Launch Terminal by navigating to Finder > Go > Applications > Utilities.
- In the Terminal window, type in the following command: diskutil list
- This will list down all the available disks on your Mac.
- Look for the disk that you want to force unmount and take note of the number of the drive.
- Type in this command next: sudo diskutil unmountDisk force /dev/diskx
- Replace /dev/diskx with the disk number of the drive you want to unmount (for example, dev/disk1).
- Wait for the process to be completed.
Solution #4: Use a Third-Party App.
If you don’t want to go through the trouble of booting using the USB boot drive or typing in commands in the Terminal, you can use a third-party tool instead. There are a lot of repair utilities to help you deal with this “Couldn’t Unmount Disk” error. These utilities can also be used to format, partition, erase, or modify your disk. Just make sure to choose a reliable app that can help you perform these tasks without any error.
Summary
The Disk Utility on macOS is a useful tool for fixing any disk-related issues or performing tasks that involve the hard drive. But this tool is not impregnable. Flaws, such as the “Couldn’t Unmount Disk” error, can happen from time to time. When this happens, simply follow the solutions listed above and you’ll be good to go.
If you’re running into errors and your system is suspiciously slow, your computer needs some maintenance work. Download Outbyte PC Repair for Windows, Outbyte Antivirus for Windows, or Outbyte MacRepair for macOS to resolve common computer performance issues. Fix computer troubles by downloading the compatible tool for your device.
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What are disk permissions and why do they need repairing?
Disk permissions on macOS are used to keep your files secure. They’re designed so that certain programs (or other users if you share your Mac) can’t just dip into a system file they have no business with and modify it. They’d need permission to do that.
Every file and folder on your Mac comes with an associated set of permissions. From the Apple Community:
“Many things you install in Mac OS X are installed from package files (whose filename extension is '.pkg'). Each time something is installed from a package file, a 'Bill of Materials' file (whose filename extension is '.bom') is stored in the package's receipt file, which is kept in /Library/Receipts/ in Mac OS X v10.5 and earlier. These files don't take up much disk space and you shouldn't put them in the Trash. Each of those '.bom' files contains a list of the files installed by that package, and the proper permissions for each file.”
Disk Utility Windows 10
Unfortunately, these permissions can easily become messed up unintentionally. It’s quite common for this to happen when installing and uninstalling apps on your system. And when it does, apps can find themselves with free reign to alter files and modify read-only files which can cause all kinds of permission errors and system issues such as lagging, freezing, or crashing.
If you notice anything out of the norm regarding system performance, the first thing you should do is troubleshoot those disk permissions.
Below we’ll show you two ways: the manual and the easy one. Choose the way that works best for you.
How to repair permissions on Mac: The manual way
If you’re running an older version of macOS, Disk Utility is the go-to tool for troubleshooting problems.
Why an older version?
Access Disk Utility On Mac Startup
Because as of macOS version 10.11 El Capitan, Disk Utility no longer comes with the option 'repair disk permissions'. Boooo!
Apple even removed the command line:
But there’s a method to the madness. macOS now comes with a feature called System Integrity Protection (SIP) which is designed to automatically repair file permissions during software updates and system changes. SIP works by restricting the root account so that it can’t do things like modify protected locations and processes such as /System and /usr. This should prevent malware from gaining root permissions and infecting your system files.
Anyway, back to using Disk Utility to repair disk permissions. If you’re running a pre-El Capitan version of macOS, follow these steps:
- Press Command + Space to open Spotlight, type in “Disk Utility”, and hit Enter.
- Select Macintosh HD from the left sidebar menu.
- Click on the First Aid tab.
- Click on Verify Disk Permissions. By taking this step, Disk Utility will work through your hard drive to detect broken or misbehaving permissions and list them for repair. This might take a few minutes but you can check the Show details box to keep an eye on its progress.
- Click on Repair Disk Permissions and wait while Disk Utility runs through the identified permissions to fix them.
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If disk permission issues have played such havoc that your Mac won’t boot correctly, it’s possible to access Disk Utility in Recovery Mode. Do this by holding Command + R during bootup.
Where Do I Find Disk Utility On My Mac
If you’re installing a newer (or older) version of macOS on top of your existing operating system, Mac will perform a disk permission repair as a part of the installation so that you start from a clean slate.
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How to repair disk permissions on Mac: The easy way
For users of macOS versions El Capitan and newer, the removal of Repair Disk Permissions means you have no troubleshooting solution to turn to in if your Mac is ailing.
But worry not, CleanMyMac X is the hero you need.
Nox player mac pubg. CleanMyMac is like Disk Utility in that it does all of the heavy lifting for you to verify permissions and repair your Mac’s disk.
Even System Integrity Protection running quietly in the background doesn’t prevent certain issues from arising. If you’re suffering from any of the following problems, boot up CleanMyMac and have it take care of business:
- Improper functioning of applications.
- Inability to move or delete files.
- Inability to access files.
If you Mac appears to be running fine, it’s still worth running repairs every so often to ensure it stays that way. Not all broken permissions affect performance but that doesn’t mean they shouldn’t be fixed.
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Repairing Disk Permissions in a few clicks
First things first, you’ll need to download CleanMyMac X. You can do that here. It’s free so you won’t need your credit card. Once that’s done, follow these four steps:
- Launch CleanMyMac.
- Click on Maintenance from the left sidebar menu.
- Check the box next to Repair Disk Permissions.
- Click Run.
CleanMyMac will scan your system to verify disk permissions and automatically repair permissions that are found to be faulty. When the task is complete, you’ll be able to view a log of all the permissions that were repaired.
And that’s all there is to it. Your Mac should now be running as intended.
Disk permissions are critical to your system’s security and performance but only when they’re working as they should. Use CleanMyMac to verify and repair disk permissions whenever you run into issues with apps or files for a healthy running Mac.
Enjoy a clean, happy Mac!