Unmount disk image from os x3/19/2023 ![]() NOTE: The discussion behind this tip is kinda long and hasn't been extensively researched. Read the rest of the article for the solution and more discussion on the question of unmounting just one partition of a volume. Disabling this daemon is probably not a good idea either, even though doing so would probably have allowed traditional methods (such as customizing /etc/fstab) to do the trick. At present, there doesn't appear to be any way to modify this behavior. Apparently the autodiskmountd daemon will attempt to mount any available filesystems it finds at startup. ![]() The idea was to have it invisible (unmounted) to the OS, so that apps and other users couldn't modify what I had stored there, unless specifically called for (mounted).Īccording to The OpenDarwin FAQ, you can't pick and choose which volumes are mounted and which are not. I wanted to set up a specific partition as an offline volume where I could keep a backup of certain files. For more information visit was trying to find a way to prevent certain volumes (partitions, in my case) from automatically mounting on startup/login. Shirley Zhang is a data recovery expert in DataNumen, Inc., which is the world leader in data recovery technologies, including damaged mdf and outlook repair software products. Based on your own case, you can opt to ask the disk repair shop nearby for help or search and contact the online disk repair service. Of course, if all means mentioned above can’t rescue you from the annoying error message, your last resort is to ask professionals for help. You should find and choose a reliable and experienced one that can help you perform the original task without such an error. Also, it’s pretty easy for you to find third party tools for formatting, partitioning or modifying disk. What’s more, fortunately, there are a lot of repair utilities dedicated to fixing this error on today’s market. Replace the “/dev/diskx” with the correct disk number, such as “/dev/disk1”. Lastly, you should type “sudo diskutil unmountDisk force /dev/diskx” line.At this time, you ought to find out the disk that you want to force unmount.Then, input the “diskutil list” line, which will list out all the disks on the Mac.To begin with, you have to access Terminal application.Moreover, you can also attempt to eradicate this error, forcing unmounting disk by command line. ![]() Lastly, select “First Aid” to re-verify the disk or choose “Erase” to format the disk at your will.Next, access Disk Utility from the boot menu.Then, when booting, hold down the “Option” key to select Recovery Partition.At this point, you can try solving it with Recovery Partition. If the error message appears during “First Aid” or formatting a non-boot disk, the above means will not make effects surely. Lastly, just perform the original task on the original disk.After that, go to “First Aid” and verify the disk.Next, in the boot menu, select “Disk Utility”.Then, during booting, you should hold down the “Option” key button to select the attached boot drive.First off, insert the USB boot drive to Mac and reboot.By this means, you can make use of USB boot drive. If this error occurs in that the disk to be modified is the boot drive, the simplest solution is to boot the Mac system from another drive and then run Disk Utility on the disk. Therefore, it is imperative to resolve this error as soon as possible. When this error pops up, not only will the Disk Utility halt suddenly, but also the disk will suffer as well, such as damaged data on this disk, like damaged Outlook file. This error generally results from improper modification of the boot drive, such as partitioning, disk verification or repairing or formatting. However, it still can fail to fix disk issues accompanied with some error messages, such as “Couldn’t Unmount Disk” error. This article will focus on this error and provide 5 feasible solutions.ĭisk Utility plays an extremely important and good role in solving disk problems on Mac system. “Couldn’t Unmount Disk” error message usually pops up when you try formatting, partitioning, verifying or repairing internal disk by Disk Utility on Mac system.
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