For example, if you try to erase or partition your boot disk in Disk Utility, you won’t be able to because macOS won’t unmount the disk. If you see an error message telling you that macOS couldn’t unmount a disk, it usually means that a process on your Mac is trying to modify your boot disk and can’t because macOS won’t allow the disk that it has booted from to be unmounted. In this article, we’ll look at both those situations and how to resolve them. That message means that a process running on your Mac has attempted to unmount your regular boot disk and has failed. However, while ejecting does the same as unmounting, the error message that includes the words ‘couldn’t unmount disk’ applies to something else. Sometimes, when you try and do the right thing and eject it first, you’ll also see an error message telling you it couldn’t be ejected. If you disconnect your USB stick or external hard drive without first ejecting it, you’ll see an error message. And you know that before you pull the plug, you should eject or unmount it. There are a number of reasons why you might want to unmount a disk on your Mac. But to help you do it all by yourself, we’ve gathered our best ideas and solutions below.įeatures described in this article refer to the MacPaw site version of CleanMyMac X. So here’s a tip for you: Download CleanMyMac to quickly solve some of the issues mentioned in this article.
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