![]() ![]() ![]() This is the recommended method as the error should always be fixed. How to Fix the disconnect error with a USB boot drive We will also show you a way to force unmount a drive through the command line, although that approach should be used with caution as it can lead to data loss on the affected drive. We’ll cover both with a little explanation. ![]() This allows you to fix the problem regardless of the cause in two ways – the first is a fix to fix the problem while the other just works sometimes. For the startup disk, it shouldn’t matter what version of Mac OS X it is for (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 – that they all do it. For the first situation where the boot disk is changed, the easiest solution is to boot from another disk and run Disk Utility from there. Usually the error message “Unable to Unmount Disk” appears up if the current boot disk is changed, or if a disk attempted to be erased, the erase may have failed with a disk error that could not be removed. ![]()
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