#Disk utility couldn t unmount disk mac os x#
#Disk utility couldn t unmount disk pro#
#Disk utility couldn t unmount disk mac#

And I can't erase the drive to get a brand new drive to work with. I hope this helps someone else, as I struggled with this for a few hours. Once you have done this, you can format the entire Volume.

You do this by selecting the partition in the left pane, and OPTION+CLICKING the 'Unmount' button. I backed up my startup drive to this drive so I could wipe and reinstall OSX on my new SU drive but now I can't delete items off the backup drive because the message says I can't delete backup items. THE EASIEST WAY TO UNMOUNT: Simply use Disk Utility to 'Force Unmount'. I have backed it up and using DU tried to erase it = by both highlighting the drive identifier and the name - in both cases, whether I try to erase disk or set it to erase to one partition, I get a message saying it can't do it because it can't unmount the disk. Yea.I have a MacPro and 4 drives inside it, one of which I need/want to erase. I then unplugged the cable and plugged it back in. I then went to Finder and did an Eject, though I'm sure I could have done that manually. The command First Aid ran is fsck_hfs -fy -x /dev/disk2s2 It runs with a -fy -x rather than just -y. I noticed that First Aid runs fsck but with different options than what was running automatically. Then in the Disk Utility I selected external disk drive and ran First Aid.Īfter First Aid completed, about 2 hours later I was able to Mount the disk through Disk Utility. Try repairing the disk in Disk Utility using First Aid. You have two options: Click on Force Eject. That stopped the fsck that had made the disk busy. Usually, there is an application running that uses the volume that you’re trying to eject. Look for the disk that you want to force unmount and take note of. In the Terminal window, type in the following command: diskutil list This will list down all the available disks on your Mac. In terminal I ran - ps aux | grep fsck followed by sudo pkill -f fsck To do this, follow the steps below: Launch Terminal by navigating to Finder > Go > Applications > Utilities. (see screenshot below) 3 Click/tap on the Remove button.

2 Right click or press and hold on the drive (ex: 'F') you want to unmount, and click/tap on Change Drive Letter and Paths. If that doesnt resolve the issue then try shutting your computer down, then unplug the disk. 1 Press the Win + R keys to open Run, type diskmgmt.msc into Run, and click/tap on OK to open Disk Management. The reason it was busy was that fsck ran as soon as I plugged the disk in. With the volume unmounted it should allow the process to complete.

#Disk utility couldn t unmount disk mac#

Firstly, launch the Disk Utility application on your Mac and make sure the.

#Disk utility couldn t unmount disk mac os x#

I tried the various fixes suggested to do it manually in Terminal. Started partitioning on disk2 Unmounting disk Error: -69877: Couldnt open. 381K views 6 years ago Mac Tips Have you ever tried to format a disk in Mac OS X and Disk Utility won't Unmount the Hard Drive for formatting It can happen for external (USB and. Had the same issue and have been fighting it for days. If you want to preserve the volume as opposed to erase the drive, here are steps. (Drive originally formatted/used on an High Sierra Mac.) Also tried an iMac which refused to mount it.

#Disk utility couldn t unmount disk pro#

I've done all of the above several times.Īny ideas for untrashing this 2TB Seagate drive? Using a MacBook Pro with High Sierra. When I try to reboot, the desktop icons disappear, the reboot never finishes and I end up forcing a shutdown via the power button. resulted in 'Unmount of disk2 failed: at least one volume could not be unmounted.' which resulted in an error that it was already unmounted or 'has a partitioning scheme so use 'disk util unmountDisk' instead' which resulted in an error -69888: Couldn't unmount disk. Sudo diskutil eraseDisk JHFS+ Reformat /dev/disk2 If youre struggling with the Couldnt Unmount Disk error, the way to fix this is to boot the Mac system from another drive and then run Disk Utility on.

one CD-ROM and that disk is part of a volume, you must unmount all the disks. With the volume unmounted it should allow the process to complete. Disk Utility failed to unmount the Data partition and reported the TM partition was OK, but I can't eject either without issues: 1,024 users share CD-ROMs CD-Manager's user interface wasn't graphical. If that does not work then highlight the volume and click unmount. Trying to reformat a drive that was used for an employee's Time Machine and Data storage.