![]() Then, when booting, hold down the Option key to select Recovery Partition. In its place would be "disk0s2." It is this indented entry that you want to erase. Methods to fix couldnt unmount disk error 1. You might see that it is displayed on the list as: physical disk: diskutil unmountdisk force /dev/disk1 diskutil unmountdisk force. To be sure you do this right, please observe that the drive may appear in the list as ghosted because it is unmounted. Disk Utility says the APFS volume still exists but cannot be mounted or. Use the device reference in this next command. If you want to wipe the entire hard drive, you will need to use an external, bootable volume to boot from. You need to make sure you are trying to erase the partition (probably called 'Macintosh HD'), and not the entire disk. It will appear similar but not the same as this: /dev/disk0s2. You can't unmount the entire disk from the Recovery Partition as it is part of that disk (disk0), and therefore in use. Fix Erase Process has Failed While Erasing Partition for Mac OS on Disk Utility. In the output, you should find your Fusion drive listed. Erase process has failed couldnt unmount disk. At the prompt paste these lines individually pressing RETURN at the end of each line. If that doesnt resolve the issue then try shutting your computer down, then unplug the disk. You should see at least two, sometimes three, entries for. With the volume unmounted it should allow the process to complete. If you are running 10.12 or 10.11 this step is not required as the option is not available. If 7z isnt already selected, then go ahead and. Set Keka as the default extraction application. Change the view to Show All Devices instead of the default which is Show Only Volumes. DMG files are disk images, which are used on Apple Mac OS X. The External Hard Drive (EHD) is finished and even if you ever got it working, never use it for Time Machine or other backups. If your volume has spaces in the name, be sure to escape the spaces with \, eg: diskutil unmount /Volumes/Disk\ Name Or use quotes to avoid confusion. If you are running macOS 10.13 (High Sierra) or later it is important to change the view in Disk Utility. iMac 5K Retina 27', August 2019, 3.6GHz Intel Core i9, Memory 32GB, 2TB SSD, macOS Monterey 12.6.3 3 Absolutely agree. It is recommended that diskutil (1) (as in, 'diskutil unmount /mnt') be used instead. If that doesn't work then quit Disk Utility and open Terminal from the Utilities' menu. Due to the complex and interwoven nature of Mac OS X, umount may fail often. After doing that click on the Unmount button in the toolbar to see if the disk disappears from the Desktop. Try repairing the disk in Disk Utility using First Aid. Flash: sudo dd if=LibreELEC-Generic.x86_64-9.0.2.img.Boot from your USB bootable drive. Click the Apple Icon in the upper left corner of the screen as shown below Select System Preferences Click Time Machine Turn OFF Time Machine or Power OFF the computer Disconnect the drive from the computer by removing the USB cable.Zero out the partition map: sudo dd if=/dev/zero of=/dev/rdisk2 bs=1024 count=1 (now you are accessing the disk in raw, so the device name is /dev/ rdisk2 and not /dev/disk2).Unmount the disk: diskutil unmountDisk /dev/disk2 (it was /dev/disk2 in my case, yours can be different, so replace the disk number in all the following commands).It is very unlikely that your USB flash or SD card is represented as /dev/disk0, because that is almost always the disk on which your system is installed Be 200% sure that you took note of the right device so that you don't damage your system.Execute diskutil list again and take note of the new disk which appeared (I will refer to /dev/disk2 going forward).Learn more about using macOS Recovery to reinstall. When you see the utilities window in macOS Recovery, select Reinstall macOS, then click Continue and follow the onscreen instructions. Plug the device you'll be flashing the image to Select your startup disk, then press and hold the Shift key while clicking Continue in Safe Mode. How to Unmount a Drive from Command Line on Mac Let’s first cover unmounting drives.Determine the disk device corresponding to USB/SD Card you want to flash to:.Unpack it: gunzip -d LibreELEC-Generic.x86_64-9.0.2.img.gz (the filename can be different, I will continue to refer to my case going forward).Get for your device from Direct Downloads. ![]() As a first line step be sure to close all open files and programs. This is how you flash the image manually on Mac: Couldnt unmount disk errors usually appear in Disk Utility when the boot drive is busy. This happened to me as well and I suspect it to be related to MacOS Catalina post
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