Erase process failed: Couldn’t unmount disk

Hello, I have a MacBook Pro 2011, or 2012 SSD, i7. While erasing my “MAC HD and creating MAC HD, the process failed. It’s states that it couldn’t unmount the disk. :(-69888). There is a process, 667 kextcache in use.

While using “Internet Recovery mode” I have already selected “Show all volumes.” I have tried to erase all three levels of hierarchy unsuccessfully: MAC HD, Container disk2, and APPLE SSD SM512E Media. I am not using Local Recovery Mode.

I haven’t been able to use my computer to for over a year and a half, and I’m at my wits end. Please help.

Posted on Feb 8, 2021 8:16 PM

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1 reply

Feb 8, 2021 8:19 PM in response to Kenny_Knoxville

This is INSANITY!!! Somehow before I finished typing my response, I was able to erase it successfully. I was stubborn and kept doing each one, and I’m not sure if there’s a certain order of operation, but keep at it, and it might work. I tried more than 20 times altogether. I hope this helps someone.

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Erase process failed: Couldn’t unmount disk

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