Normally, any ‘Couldn’t Unmount Disk’ error is attributed to circumstances where the boot drive is being modified or is being used by an application or process. You can select the preferred volume from the sidebar in Disk Utility and click Unmount or Mount in the toolbar.I have found myself recently experiencing a couple of Macs which would not allow me to repair the directory or permissions in Disk Utility, or erase/partition the drive with an error such as: ‘Disc erase failed couldn’t unmount disc’ or ‘Disk Erase failed with the error: Couldn’t unmount disk.’Įven trying to use Network Deployment tools such as Apple’s Netinstall service or DeployStudio have also failed to deploy due to these errors. You should back up all wanted files on the destination volume to another place beforehand. Please note that this will create an exact copy of the original volume and all the files on the destination volume will be erased.
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