Error unmounting disk

I have been unsuccessfully trying to erase the disk of my macair before giving it away. I got an error message, so I went through command line as instructed elsewhere on this forum. However, I get the following message:

MacBook-Air-6:~ alexandraverini$ diskutil unmountDisk force /dev/disk0

Forced unmount of disk0 failed: at least one volume could not be unmounted

Unmount was dissented by PID 0

MacBook-Air-6:~ alexandraverini$

What should I do now?

Posted on Aug 10, 2019 1:04 AM

Top-ranking reply

SandsOfArrakis

Level 4

1,258 points

Posted on Aug 10, 2019 2:53 AM

What happens if you run disk utility in recovery mode? Because it appears to me you are trying to erase the system disk while MacOS is running. That's not going to work.

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