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#Couldnt unmount disk how to

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.

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.

#Couldnt 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.