It is a broken-down macOS version containing the necessary aspects for running and restoration. You must have bumped into it when going to recovery mode or accessing the Disk utility. It is vital in troubleshooting and dealing with any Disk Utility challenges with the Mac. The base system is the essential part of the Mac that helps it recover and reinstall when you have operational issues or want to install a different OS. Therefore, it is crucial to know what the macOS base system is, what it contains, and why it is critical for your computer. Therefore, it is not worth the risk.īesides, the system doesn’t take up a lot of space anyway, and nothing will change if you could erase it. It has dire consequences to the entire device, like rendering your computer inoperable. There is no way to erase macOS even if there were, you should not try it. It is impossible to install the operating system again or solve issues with failure to boot. It is the structure that helps you access macOS utilities for recovery. If you delete it, you face the irreversible effect of your computer never rebooting or restoring. It was deliberate because the company knew some users would try it at some point. It would be amazing if you could do the same with your macOS base system.Īpple has ensured you cannot erase the macOS base system because of the risks involved. You can factory reset your phone and erase everything, which works to get it running again. Resetting the system is handy when you want your device to resume its regular operation. Read on to find out how possible this is and, if not, whether there are practical alternatives to try. If you are running into problems with your macOS, your next thought may be to force everything to erase to start on a clean slate. The base system is the fundamental structure that allows access to the macOS utilities in case you are performing a recovery without it, it will be challenging to reinstall the operating system. Deleting it will prevent the system from rebooting, rendering your Mac inoperable. So, why can’t I erase the macOS base system? Erasing the macOS base system is the riskiest task on your computer, and Apple has made it impossible to prevent this. If you have a MacBook or iMac, you must have such a system, but what happens when there are operational issues? Can you erase or unmount the basic structure? But before trying this method, make sure that the recovery drive is located in the drive (a separate copy of os installed on it).Every computer has a basic structure that dictates how it operates and a backup system in case something fails. This fix has worked for many users, so there are high chances that this will work for you as well. Fix “Couldn’t Unmount Disk” Error with USB Boot Drive If the issue is still there, then assume that the error is caused by modifying the bootable disk. Once the process is finished, check if the issue has resolved. Or go to Erase in order to format the disk. Step 3: Visit First Aid and try to repair the disk. Step 2: A boot menu will appear, here, select to choose “Disk Utility”. Step 1: Restart your Mac while pressing and holding the Option key, and then select to choose Recovery partition. If that’s not the case, this fix is worth trying, here’s how to resolve the error with the recovery partition: Mind you, this fix will not work if the error was caused by modifying the bootable disk while creating a partition or formating. Fix “Couldn’t Unmount Disk” Error with Recovery Partition Let there be any Mac OS X version as it doesn’t matter (assuming 10.7 to 10.14 and above), this error can be easily resolved only if Disk utility is present on the drive.Īnyways, let’s head towards the actual fixes. Keeping the fact in mind that Disk Utility able to execute from the external drive, we can use it to boot Mac from another bootable drive. Good thing is that a valid solution is available that will help us to resolve the “Couldn’t Unmount Disk” Error on Mac. SEE ALSO iTunes Not Showing Album Artwork? Here's how to fix it.
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