For this we use the Activity Monitor app. Once we know what process is preventing us from ejecting our disk, we can force it to stop. Do diskutil umount force /Volumes/Macintosh HD/ Take note of your disk id. Along the same lines, if you want to remount a drive you can usually just physically unplug the drive and plug it back again. For many users, the easiest way to unmount a drive in Mac is to either just drag a volume into the Trash, use the eject keys, disconnect the drive, or use one of the force eject methods. Close Disk Utility and go to the command line terminal. You can mount and unmount drives, volumes, and disks from the command line of MacOS and Mac OS X. Why does Quicklook preventing me from ejecting my disk? I suspect that this is just a bug. Go to Disk Utility and mount your Mac volume. If I preview any other file like PDF or JPG the disk can be ejected normally. I noticed that when I use the Quicklook feature to preview a video in any format, the process keeps active even when the Quicklook window was already closed. The QuickLook process is a feature that was introduced in the Mac OS X 10.5 Leopard. Being unable to unmount a disk on your Mac can seem like a terrifying and challenging problem to solve. Press Return and type in your admin password if you’re asked for it. Note! In some cases, macOS will allow us to “force-eject” the disk, but we may still lose data, so force eject is not reasonable.Īfter some investigation I found that in my case this is the QuickLook process. Type: sudo diskutil unmountDisk /dev/disks1 replace ‘disks1’ with the identifier you noted in Step 4. Now I need to know what app is using my disk so I can properly quit that app and eject my disk. As far as I’m aware, I’m not using the disk but Finder says I do, so I must be wrong. If this happens, we just need to close the file in question and try again eject the disk. You can use it from the Normal Mode if you want to unmount any external drive. If we have any file stored on the disk open in any app, macOS may prevent us from ejecting the disk so we don’t lose any of our data. Unmount a Disk Using Terminal.If previous steps didn’t work, you can use Terminal to fix can’t unmount disk on Mac.Open Terminal from the Recovery Mode if you need to unmount the drive you are currently booted from. Unmount Disk Mac Terminal Your internal Macintosh drive is also formatted in this format It is not a good idea to force unmount as it may corrupt the data on the file system Open up Terminal and type in the following: sudo umount -f '/Volumes/NameOfVolume' Replacing NameOfVolume with your volume’s name Masukkan perintah : diskutil list ) Run diskutil cs list Livermore Crime. It means that we are trying to eject the disk that is currently in use. But to my surprise when pressing the ‘eject’ button Finder warns me with the following error message:įor more experienced users, I recommend reading another article about this issue. After working with an external hard drive (further simply - disk) I want to cleanly unmount it.
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