![]() ![]() You can leave a comment on my original post. ![]() To mount the drive again, without having to take it out and plugging it in again, I can issue this command: If the Erase button is dimmed, the selected volume can’t be erased. If Disk Utility isn’t open, click the Launchpad icon in the Dock, type Disk Utility in the Search field, then click the Disk Utility icon. We need to specify the location of the partition with its full path (i.e. In the Disk Utility app on your Mac, select the APFS volume you want to erase in the sidebar. On my system I have two internal hard disks (disk0 and disk1), and one external USB drive (disk2). For that using the terminal application again, enter the following command: sudo diskutil unmount force /dev/(enter here disk identifier name) Then press. It is those partitions we’ll mount and unmount, NOT the physical drive. Make a mental note of the latter: you’ll see that we have a physical disk (like disk0), on which several partitions may have been created. Note or copy the name of the disk you want to unmount. Press Return to see the list of connected disks. ![]() Type diskutil list in the Terminal window. Per man umount, umount may fail for any number of reasons, and the recommend command is instead diskutil: diskutil unmount /Volumes/VolumeName. dev/disk0, /dev/disk1, etc), as well as with their respective partitions if available on the right (like disk0s1, disk1s2, etc). To unmount a disk in Terminal: Open Terminal in Applications > Utilities or choose Terminal from Utilities in Recovery Mode. Youll need to know the name of the mount point - that is, the name in /Volumes that corresponds to that network drive. You’ll see output like this:Ģ: Apple_HFS Macintosh SSD 511.3 GB disk0s2ģ: Apple_Boot Recovery HD 650.0 MB disk0s3Ģ: Apple_HFS Mac HDD 1TB 999.9 GB disk1s2Īttached drives are listed with their physical locations on the left (i.e. To see what’s currently attached to your Mac, let’s use the diskutil command, followed by the word list. Fire up a Terminal session and see how to do it. However, there is a way to do this via the command line, of which I am a big fan. You must have superuser privileges to do this. Unmount the drive by typing the command sudo umount followed directory that it is mounted on. Locate your drive, remember the path that it is Mounted on. Mounting usually happens automatically when a new drive is inserted into a USB port or SD card slot. Open a terminal and type df -h to list all drives. And I can't erase the drive to get a brand new drive to work with.Unmounting external drives on a Mac is usually done quick and simple by either dragging drive icon to the trash, or by using the eject symbol in a Finder window. 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. 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. Caution must be used with this approach however because forcibly unmounting a disk can cause data loss of the drive being forcibly unmounted. Another method uses the command line to force unmount a disk, but this is not the top recommended option because of potential for data loss. I have a MacPro and 4 drives inside it, one of which I need/want to erase. Solution 7: Forcibly Unmount a Disk via Terminal. ![]()
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