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CANNOT UNMOUNT DISK HOW TO
CANNOT UNMOUNT DISK MAC OS X
CANNOT UNMOUNT DISK MAC OS
CANNOT UNMOUNT DISK INSTALL

Go to “First Aid” to check and repair the disk or go to “Remove” to format the diskĪgain, if the error-throwing disk is the same as the primary boot partition, which also has a restore, the above method may not work to resolve the issue.

Select “Disk Utility” from the boot menu.

Restart your Mac by holding down the “Option” key and selecting the recovery partition.

This will not work if the error was triggered by trying to modify the startup disk using partitions or formatting, and you must use the above method with the startup disk.

CANNOT UNMOUNT DISK MAC OS

If the Unable to Unmount error is triggered by First Aid or non-boot partition formatting, you may be able to fix the error by booting from the recovery partition that is included with all newer versions of Mac OS X.

Use the Mac Recovery partition to fix disk utility errors For older Macs with earlier versions of Mac OS X, all operating systems running OS X 10.6 or earlier have a SuperDrive drive, so they come with a bootable DVD that can serve the same purpose. Such boot drives are easy to create yourself, here are instructions for creating boot disks for OS X 10.9, OS X 10.8, and OS X 10.

CANNOT UNMOUNT DISK MAC OS X

This is a good example of why it is very valuable to have a bootable USB flash drive installed regardless of which version of Mac OS X is running on your Mac, because without a separate boot drive, some of these errors cannot be resolved.

The steps above did the trick and everything worked again as expected. I’ve recently come across this twice, first when trying to modify the status of partitions that came right along with a separate “partition failed” with the error, and again launched into, when I tried to format these partitions. Now run the original task that threw the “Cannot remove” error.Go to First Aid and check the disc, and then repair if necessary.Select “Disk Utility” from the boot menu (if you are using the Installer disk, open the “Utilities” menu to access the Disk Utility).Hold down the OPTION key during boot and then select the connected boot drive (usually there is an orange icon in the boot menu).Attach the USB boot drive to your Mac and restart it.

CANNOT UNMOUNT DISK INSTALL

You need any Mac OS X boot drive to perform this task, I used a Mavericks boot drive for this purpose, but others should work as well, whether they are install drives or just recovery drives, the most important thing is that they are bootable and a separate primary boot disk that stores the installed operating system: This is the recommended method because it should always correct the error.

CANNOT UNMOUNT DISK HOW TO

How to resolve a disconnect error on a USB boot drive We will also show you a way to forcibly remove a disk from the command line, although this approach must be used with caution as it can lead to data loss on that drive. We will deal with both with a little explanation. This allows you to fix the problem regardless of the cause in one of two ways, the first is a sure thing to fix while the second only works sometimes. No matter what version of Mac OS X it is on the boot drive (assuming at least 10.7, 10.8, 10.9, 10.10, 10.12, 10.13, 10.14, etc.), the only requirement is that it has Disk Utility – which they all do. In an earlier situation where the boot drive is modified, the easiest solution is to boot from another drive and run Disk Utility from there. The “Disk Removal Failed” error pops up when the current drive is changed, or if an attempt was made to remove the disk, you may find that the removal failed when the disk error failed.