But before trying this method, make sure that the recovery drive is located in the drive (a separate copy of os installed on it). This fix has worked for many users, so there are high chances that this will work for you as well. Fix “Couldn’t Unmount Disk” Error with USB Boot Drive Then reboot normally holding down the Option key. dev/diskx should be replaced with the correct disc. Finally, type sudo diskutil unmountDisk force /dev/diskx on the command line. You should now locate the disc that you want to unmount forcefully. After that, type diskutil list to get a list of all the discs on the Mac. If the issue is still there, then assume that the error is caused by modifying the bootable disk. Boot into the Recovery volume (boot with the Command + R keys held down) and erase the internal drive from there. To begin, you must open the Terminal application. Force will force-unmount the volumes (less kind to any open files see also umount (8)). unmountDisk umountDisk force device Unmount an entire disk (all volumes). Force will force-unmount the volume (less kind to any open files see also umount (8)). Once the process is finished, check if the issue has resolved. From man diskutil: unmount umount force device Unmount a single volume. Or go to Erase in order to format the disk. Step 3: Visit First Aid and try to repair the disk. Step 2: A boot menu will appear, here, select to choose “Disk Utility”. Step 1: Restart your Mac while pressing and holding the Option key, and then select to choose Recovery partition. The diskutil list command brought up just /dev/disk0 (plus disk0s1, disk0s2 and disk0s3). If that’s not the case, this fix is worth trying, here’s how to resolve the error with the recovery partition: Trying to erase my hard drive and it won’t unmount: Disk erase failed. Mind you, this fix will not work if the error was caused by modifying the bootable disk while creating a partition or formating. A new try to erase Macintosh HD and creating Macintosh HD failed with the following alert: Erasing Macintosh HD disk2s5) and creating Macintosh HD Preparing to erase APFS volume content Checking mount state The volume Macintosh HD on disk2s5 count be. Fix “Couldn’t Unmount Disk” Error with Recovery Partition Press a key or wait a few seconds to continue starting up. Now, select the external device from the sidebar and click on the 'Erase' button. Firstly, launch the Disk Utility application on your Mac and make sure the external device is connected to it. Let there be any Mac OS X version as it doesn’t matter (assuming 10.7 to 10.14 and above), this error can be easily resolved only if Disk utility is present on the drive.Īnyways, let’s head towards the actual fixes. To adjust its security level and fix the erase process has failed on Mac, follow these steps: Step 1. Keeping the fact in mind that Disk Utility able to execute from the external drive, we can use it to boot Mac from another bootable drive. In Disk Utility, I select the internal partition containing High Sierra (also 10.13. Good thing is that a valid solution is available that will help us to resolve the “Couldn’t Unmount Disk” Error on Mac. chencho said: EDIT: Seems I need to umount the lxc pct unmount 702 and now it start again. SEE ALSO iTunes Not Showing Album Artwork? Here's how to fix it.
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