When your Mac is getting the “Couldn’t Unmount Disk” error when using the Disk Utility, it is possible that the boot drive cannot be modified because it is being used by some process or an application. What Causes the “Couldn’t Unmount Disk” Error in Disk Utility for Mac? Once this pops up, the current process gets halted and could no longer proceed, affecting any troubleshooting process or disk repair you might be doing. Disk Utility stopped verifying (letter of the hard disk).About Outbyte, uninstall instructions, EULA, Privacy Policy. Here are some variations of the error message that Mac users encounter, depending on the process being executed when the error happened: What makes this error frustrating is that there is usually very little to no additional information provided by the error message, making it more challenging to resolve the problem, And based on the error message, it is even harder to determine what the problem is all about. The “Couldn’t Unmount Disk” error can happen during formatting, partitioning, disk verification and repair, or any task that the Disk Utility undertakes. What is the “Couldn’t Unmount Disk” Error on Mac? When this error pops up, any attempted task gets stopped right in its tracks. One of the common errors encountered when using Disk Utility is the “Couldn’t Unmount Disk” error. Use it when your apps quit unexpectedly, your external drive isn’t working, or your Mac won’t start up.ĭisk Utility usually works smoothly, but there are times when frustrating errors occur and prevent the process from being completed. It can check the health of your hard drive and repair any disk errors. Shut down your Mac: Turn off your Mac, then unplug your Time Machine backup disk.Disk Utility is a crucial tool for resolving disk issues on your Mac. Then type "sudo diskutil unmountDisk /dev/disk2" to unmount the disk, followed by "sudo diskutil eject /dev/disk2" to eject it. Find the disk you want to eject and note its identifier (e.g., /dev/disk2). Open Terminal and type "diskutil list" to get a list of all connected disks. Use Terminal: If force ejecting doesn't work, you can try using Terminal to unmount and eject the disk. This should force the disk to unmount and eject. Try force ejecting: Press and hold the Option key while clicking the Eject button in Finder. If that doesn't work, try the following solutions to eject your Time Machine backup disk. (Select the process > click the ⤬ button > select Quit.) If you've waited long, you can stop these processes from running in Activity Monitor. If you're not in a hurry, you can wait for the indexing process to complete.Īs far as I know, that's how many users who can't eject their external drives because of running processes chose to do and eventually ejected it successfully. It will return the processes that are currently using your drive, which are likely Spotlight processes like mds or mds_store. Note that you need to replace yourdiskname with the actual name of your Time Machine backup disk. If you still can't eject it, you can run the following command in Terminal to learn the processes that are preventing your disk from being unmounted or ejected. You can quit all the programs that may be using your drive and retry ejecting it. As the error " The disk wasn't ejected because one or more programs may be using it" suggested, your Time Machine backup disk is still accessed by some background processes or programs, even though you're not actively using it.
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