- #Mac disk utility repair failed volume is already unmounted how to#
- #Mac disk utility repair failed volume is already unmounted full#
- #Mac disk utility repair failed volume is already unmounted download#
- #Mac disk utility repair failed volume is already unmounted mac#
The only solution is to boot from a different volume than the one you’re trying to modify.
#Mac disk utility repair failed volume is already unmounted full#
There is always a risk of losing data, and making a full backup is the only way to protect your data.
#Mac disk utility repair failed volume is already unmounted how to#
How to fix ‘couldn’t unmount disk’ errorīefore you try and fix any problem with a disk, including one that can’t be unmounted, you should back it up. Essentially, the erase process has failed on your Mac. 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.
#Mac disk utility repair failed volume is already unmounted mac#
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.
#Mac disk utility repair failed volume is already unmounted download#
A background process called QuickLookSatellite, which manages some aspects of generating previews for QuickLook in the Finder and elsewhere, had stalled.So here's a tip for you: Download CleanMyMac to quickly solve some of the issues mentioned in this article. The Macworld reader who reported this problem and that the solution worked for some drives had to use an additional bit of troubleshooting to fix another. The disk number appears in a couple of places in the utility’s output.
Reconnect the drive and power it up if necessary. Power down the drive if it has a power switch. (replace diskX with the number of the disk, like disk3). You may see multiple entries that start the same (as in the figure), such as disk3, disk3s1, and so forth. In the resulting list, find the disk number associated with the unmounted volume. Plug the drive in and power it up if necessary.
(This problem may affect drives formatted for Windows and macOS mounting more than HFS+ or APFS formatted drives, but it’s unclear.)įirst, you need to find out what macOS’s internal representation of the disk is: In some cases, you may be unable to remount a drive ejected early due to a power outage, shutting a computer down abruptly, or pulling a plug before macOS was ready.Ī few Terminal commands can help in at some cases, including solving a problem for one Macworld reader who had amassed three drives that could be mounted under Windows but macOS refused mount or allow Disk Utility to perform repairs on. MacOS alerts you when an externally connected drive was unmounted before the operating system had a chance to tidy up all the loose ends on it.
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