Read the warning message as well, then click. Read the confirmation dialog to confirm you’ve selected the correct drive, then click Run to start the disk repair process. Click on the First Aid icon in Disk Utility’s toolbar (found in the top-right corner of the Disk Utility window) to start the repair process.You can also click the Launchpad icon on your dock, click the Other folder, and then click Disk Utility. Disk Utility will check the health of your hard drive and repair any disk errors if possible.To access the Disk Utility in macOS, just press Command+Space to open Spotlight search, type Disk Utility into the search box, and then press Enter. For example, you can run a disk check when your apps quit simultaneously, an external drive is not working properly, or your Mac won’t startup.What is the “Couldn’t Unmount Disk” Error on Mac?Question: Q: Disk Utility won't mount a disk I have a 1TB HDD that was in a backup system that I'm sending in to the vendor for replacement. 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. Disk Utility usually works smoothly, but there are times when frustrating errors occur and prevent the process from being completed.
Make A Utility Disk For My Software Is RunningWhen a malicious software is running in the background and wreaking havoc on your Mac, you might get the “Couldn’t Unmount Disk” error when you try to do something with your hard drive. For example, a file from the disk you are trying to erase could be open, which means that you can’t proceed with the erasing unless all the files are closed.Another possible reason is the presence of malware. What Causes the “Couldn’t Unmount Disk” Error in Disk Utility for Mac?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. Disk Utility stopped verifying (letter of the hard disk)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. About Outbyte, uninstall instructions, EULA, Privacy Policy. 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.Here are some variations of the error message that Mac users encounter, depending on the process being executed when the error happened:Special offer. ![]() You can use an installation drive or a recovery drive, as long as it is bootable and it is separate from the primary boot disk where your macOS is installed.Here are the steps you need to follow to resolve this error using a USB boot drive: This should fix any errors related to corrupted junk files or cached data on your Mac.Once you’ve completed the steps above, you can now proceed with the main solutions: Solution #1: Use a USB Boot Drive to Repair the Hard Drive.If “Couldn’t Unmount Disk” error occurs when you are trying to modify the boot drive, the easiest solution is to boot your Mac using another drive, and then run Disk Utility from that disk. Declutter your system by cleaning up your computer with a Mac cleaning tool. Disable your security software after running the scan because it might prevent the processes from pushing through. Delete any malicious software detected using your antivirus and delete all related files. Pcnexus java emulator for macWhile booting up, hold down the Option key to boot using the Recovery Partition. If this is the case, you can try resolving the error using Recovery Partition. Once your disk has been verified, you can then proceed with the task you were trying to perform when the error occurred.If the “Couldn’t Unmount Disk” error message appears when doing First Aid on your disk or formatting a non-boot disk, the first solution will not work. Click First Aid at the top menu to verify the disk. While restarting, hold down the Option key button and choose the attached boot drive. In the Terminal window, type in the following command: diskutil list Launch Terminal by navigating to Finder > Go > Applications > Utilities. Solution #3: Use Command Prompt to Force Unmount the Disk.If the above methods don’t work and your disk is pretty stubborn, you can attempt to fix this error by forcing to unmount the disk using commands. Click First Aid to verify the disk or select Erase to format the disk if needed.Keep in mind that this method will only work if the disk that is throwing the error is not the same as the primary boot partition where the Recovery Partition is saved. ![]() SummaryThe Disk Utility on macOS is a useful tool for fixing any disk-related issues or performing tasks that involve the hard drive. Just make sure to choose a reliable app that can help you perform these tasks without any error. These utilities can also be used to format, partition, erase, or modify your disk. ![]()
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