![]() This should fix any errors related to corrupted junk files or cached data on your Mac. Declutter your system by cleaning up your computer with a.Disable your security software after running the scan because it might prevent the processes from pushing through.Delete any malicious software detected using your antivirus and delete all related files. ![]() Run a scan to check for the presence of malware.Make sure you have enough permissions to read and write to the drive you want to modify.Close all applications and files before attempting the repair.But before you do so, here are some of the basic troubleshooting you should take care of first: If your Mac is getting the “Couldn’t Unmount Disk” error, don’t worry because there are several ways to handle this problem. How to Fix the “Couldn’t Unmount Disk” Error on Mac 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. Other factors you should look into include corrupted system files, bad hard drive sectors, or insufficient permissions. This is because the malware might be making changes to your hard drive without you knowing it. 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. ![]() 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.Īnother possible reason is the presence of malware. 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. What Causes the “Couldn’t Unmount Disk” Error in Disk Utility for Mac? 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.
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