![]() You still won't be able to unmount a volume you've booted from, but you can use it to unmount an external drive or from recovery mode to unmount your primary boot drive. If nothing else works, you can use Terminal to unmount a drive. How to Fix the Couldnt Unmount Disk Error on Mac Solution 1: Use a USB Boot Drive to Repair the Hard Drive. Identify which application is using the disk and close it, then try to eject the disk again.This will clear the error and eject the drive, but it may also damage the data on it. ![]() Usually there is an application running that is using the volume you are trying to eject. Normally, when you see the error message that an external drive cannot be ejected, there is an explanation as to why. You should see some disks appear like /dev/disk0, /dev/disk1, /dev/disk2. Then paste in the command: diskutil list. Launch up Terminal.app (through /Applications/Utilities or through a Spotlight search). How to fix when an external drive won't unmount Couldn’t unmount disk, then you may have to force an unmount through the terminal. When your Mac restarts, start Disk Utility and try what you were trying to do again.Exit System Preferences and restart your Mac.Method 2: Fix Couldn’t Unmount Disk Mac Issue Using The Recovery Partition The above issue can also occur when doing first aid or formatting a non-boot partition. Finally, on the original disc, complete the original task. Command-line can be used to eradicate 'Can't unmount disk' from Mac. Terminal application allows you to control your Mac operations via the command prompt. Click on the lock and type your admin username and password. Then go to First Aid and double-check the disc. When the first aid could not unmount the volume for repair, try using the 'Use the terminal application' method to unmount the disk volume.Would you like to force unmounting of this medium Could not unmount the currently mounted media/drive (VERRPDMMEDIALOCKED). To eject the disk immediately, click the Force Eject button. If I try to unmount from Finder, I receive this message: The disk Storage wasn’t ejected because one or more programs may be using it. Click on the Apple menu and choose System Preferences. Unable to unmount the CD/DVD image C:Program FilesOracleVirtualBoxVBoxGuestAdditions.iso from the machine Ubuntu Desktop 12.04 64-bit. Verify and Repair volume Storage Error: Could not unmount disk.Attach a disk with a bootable installation of macOS. ![]()
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