#MAC COULDN T UNMOUNT DISK HOW TO#
#MAC COULDN T UNMOUNT DISK MAC OS#
#MAC COULDN T UNMOUNT DISK VERIFICATION#
#MAC COULDN T UNMOUNT DISK SOFTWARE#
#MAC COULDN T UNMOUNT DISK MAC#

Look for the disk you want to force unmount and take note of the drive’s number.

Input ‘disktil list’ on the command prompt to get a list of all the available disks on your Mac.

From the ‘utilities’ menu access the ‘terminal application’.

If you’ve tried the above methods and none has worked, you can fix this error by forcing to unmount the disk using commands. You’ll need to boot from a separate USB drive to fix the error. If the disk throwing the errors is the same as the primary boor partition, this method will not work.

Go to first aid to verify and repair the disk or click on ‘erase’ if you want to format the disk.

Click on the ‘disk utility’ on the boot menu.

From the boot menu select the ‘recovery partition’ option.

#MAC COULDN T UNMOUNT DISK MAC#

Reboot your Mac holding down the ‘option’ key.

This method won’t work if the error was triggered by an attempt to modify the boot disk through formatting or partition.

#MAC COULDN T UNMOUNT DISK MAC OS#

You can try and fix the error by booting the recovery partition that is available in all the new version of Mac OS X. This method will help fix the above error if it’s caused by first aid or when formatting a non-boot partition.

The repair is now done and you can perform the tasks that were halted because of the error.

Once the repair process is complete, it will show ‘operation successful’ then you can click the ‘done’ option.

Click on the ‘run’ option to move the process forward.

A second screen will appear that will ask you to select an option.

Click on the ‘first aid’ option to verify the disk.

On the boot menu select the ‘disk utility’ to access it.

While rebooting, hold down the ‘option’ key button, then select the attached boot drive on the menu.

Attach the USB boot drive to your Mac, then reboot.

However, the recovery drive or the installer should be in the drive separate from the primary boot disk with the installed OS on it. If you’re trying to modify your boot drive and this error appears, using a USB boot drive is the easiest method to boot your Mac using another hard drive and running your disk utility from that drive. There are several ways you can fix your disk error. Methods to fix ‘couldn’t unmounts disk’ error on your Mac Other reasons that could prompt such an error include: When you delete some of the system data or file accidentally, it can lead to a data loss or getting a faulty disk error.

Unintentional or forced data formatting.

Human error.This will happen when you try to delete or format data improperly between ongoing operations and this will cause a disk error.

#MAC COULDN T UNMOUNT DISK SOFTWARE#

This can be due to the software accessing unauthorized websites or making changes to your hard drive without your knowledge.

If there’s a malicious software running in the background and damaging your Mac, this might cause such an error when you try to do something on your hard drive. Or because your Mac is trying to access data in a hurry which causes a sudden interruption in the system which can lead to data corruption or data loss. Maybe you’re trying to delete a file that you’ve opened so it can’t process a delete before you close the file. Interrupted reading or writing operations.When your Mac displays this kind of error when using the disk utility, it could be because of: What causes the ‘couldn’t unmounts disk’ error on Mac?

#MAC COULDN T UNMOUNT DISK HOW TO#

Some common Mac error messages and how to fix them.Methods to fix ‘couldn’t unmounts disk’ error on your Mac.Other reasons that could prompt such an error include:.What causes the ‘couldn’t unmounts disk’ error on Mac?.Problems were encountered during repair of the partition mapĮrror: -69808: Some information was unavailable during an internal lookup diskutil eraseDisk JHFS+ Untitled disk1įor the first error I did subsequently: diskutil unmountDisk force disk1

#MAC COULDN T UNMOUNT DISK VERIFICATION#

Problems were found with the partition map which might prevent bootingĮrror: -69808: Some information was unavailable during an internal lookup diskutil verifyVolume disk1snĮrror starting file system verification for (bad disk ref): Disk object invalid or unable to serialize (-69810) diskutil repairDisk disk1

I have tried the following: diskutil verifyDisk disk1 I have an external drive which is only recognised running diskutil list in Terminal, not in the GUI version or Finder: /dev/disk1 (external, physical):ģ: Microsoft Basic Data XHDD 249.6 GB disk1s3

Mac couldn t unmount disk