![]() ![]() About Outbyte, uninstall instructions, EULA, Privacy Policy. This should allow you to fix the problem. For the boot drive, it does matter what version of Mac OS X or macOS it was created for, as long as it has Disk Utility – which they all do. ![]() If the boot drive is being modified as the first situation suggests, the easiest fix is to boot from another drive and run Disk Utility from there. ![]() It could also happen if the disk you are trying to erase has failed the process with a Couldn’t unmount disk error. Couldn’t unmount disk: (-69888) error on Mac pops up when the current boot drive is being modified. There is usually very little to no additional details given as to how to fix the problem or even what the problem is about, making it harder for users to understand this issue.īasically, the “Erase process has failed. This issue can pop up when doing partitioning, disk verification and repair, or even during formatting. Couldn’t unmount disk: (-69888) error on Mac can stop whatever task the utility is attempting right in its tracks. But sometimes a frustrating “Erase process has failed. Disk Utility usually runs trouble-free most of the time. ![]()
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