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If that doesn't work then quit Disk Utility and open Terminal from the Utilities' menu. After doing that click on the Unmount button in the toolbar to see if the disk disappears from the Desktop. Hold down the OPTION key during boot, then select the attached boot drive (typically has an orange icon at the boot menu) At the boot menu, choose Disk Utility (if using an Installer disk, pull down the Utilities menu to access Disk Utility) Now perform the original task that threw the Couldn’t Unmount error. But, when trying to partition, Disk Utility said that it cannot unmount the.
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Trying umount on /dev/mapper/cachedev1 at this point won't work (the whole problem), so: Figure out what's keeping the RAID busy: mount | grep CACHE* which returns: /dev/mapper/cachedev1 on /share/CACHEDEV1_DATA type ext4 (rw,usrjquota=er,jqfmt=vfsv0,user_xattr,data=ordered,delalloc,noacl) /share/CACHEDEV1_DATA/.qpkg/ubuntu-hd/lxc/ubuntu_1604/rootfs/lib/modules/3.19.8 on /share/CACHEDEV1_DATA/.qpkg/container-station/kernel-module/ubuntu-hd type none (rw,bind) Next, disable swap: swapoff -a Be sure to get out of the way: cd / Then unmount the above: umount /share/CACHEDEV1_DATA/.qpkg/ubuntu-hd/lxc/ubuntu_1604/rootfs/lib/modules/3.19.8 Then unmount the RAID, finally: umount /share/CACHEDEV1_DATA NOW, AT LAST, we can e2fsck: e2fsck_64 -f -v -C 0 /dev/mapper/cachedev1. Try repairing the disk in Disk Utility using First Aid. So I tried to use Disk Utility to erase the startup disk and make a new partition. Turns out it's /dev/mapper/cachedev1 on my TS-453A. One more advice on troubleshooting is to check in the details tab for any active processes still running by the user (could be something like explorer.exe) which might indicate a session that isn't cleanly logged off. You attempt to unmount a currently mounted disk and you receive the error Unable to umount : device or resource busy.
#Unable to unmount disk install
Give it a few minutes, install should start.
#Unable to unmount disk mac
Press space while hovering over Install macOS Sierra from Mac HDD, or something similar. Stop all services: /etc/init.d/services.sh stop /etc/init.d/opentftp.sh stop /etc/init.d/Qthttpd.sh stop /etc/init.d/rsnap.sh stop Establish where the RAID is with df. Glad to hear that you have found the solution. Unmount the EFI partition Also unmount WINDOWS partition if you can see it from Mac 6. Finally sorted out, with the help of a learned friend.