And I can't erase the drive to get a brand new drive to work with. If you unmount and disconnect a disk and then reconnect the disk later, Disk Utility rebuilds the disk member automatically if you selected Automatically rebuild when creating the disk set. Disconnect the disk member that you want to unmount. 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. Click the Unmount button in the toolbar or beside the disk set name. 4 Ways to Fix Couldnt Unmount Disk/Volume for Repair Error on Mac Click on the Spotlight icon from the menu bar. You can also try following this article to format it if you have a Windows computer. appears when attempting to modify the boot disk, which you cant because its where your operating. Try formatting that to format the entire drive. In the side bar in Disk Utility you should now see something like '2TB Seagate Drive' or something like that. When using PARTITION function to erase the existing partition, it would proceed 'Preparing to remove partition' but would take ages & never completes it - I would have to quit Disk Utility to force stop it. The volume 'Macintosh HD' on disk2s5 couldn't be unmounted because it is in use by process 655 (kextcache) Couldn't unmount disk. Disk Erase failed with the error: Couldn't unmount disk'. 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. Here are the steps: Boot the recovery volume, which will take you to an OS X Utilities page that shows four options: Restore From Time Machine Backup, Reinstall OS X, Get Help Online, and Disk Utility. You cant just use Disk Utility to reformat an APFS disk to HFS+ - once it has been converted to APFS, the only options that appear for erasing an APFS disk are. 5 Answers Sorted by: 1 Try going to Disk Utility then press View in the menu bar and 'Show All Devices'. It says, 'Erase process has failed.' Details say the following: Erasing 'Macintosh HD' (disk2s5) and creating 'Macintosh HD' Then it says: Preparing to erase APFS Volume content. I have a MacPro and 4 drives inside it, one of which I need/want to erase. If you want to create a bootable USB flash drive/hard drive only for uEFI.
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