Disk Unmount error

Question

Disk Unmount error

I am trying to erase my mac ssd using terminal in recovery mode. I tried :

diskutil erasedisk APFS MACOS GPT /dev/disk0 : this command shows -

Starting erase on disk0

Unmounting disk

Error: -69888 : Couldn't unmount disk

Then I tried force unmounting disk0 by - diskutil unmountDisk force /dev/disk0, but this also shows :

Forced Unmount of disk0 failed: atleast one volume could not be unmounted

i had erased my mac before using disk utility but there now its showing it as unformatted and i am stuck.

Can someone help ?

Thanks.

MacBook Air

Posted on Jun 4, 2019 3:25 AM

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Answer 1

Top-ranking reply

HWTech

Level 9

69,212 points

Jun 4, 2019 9:07 PM in response to alpha_gohan7435

Try booting into Internet Recovery Mode to erase the drive. You are booting into local Recovery Mode from the SSD itself which is why it cannot unmount the drive. You are also attempting to erase the whole drive (disk0) and not just the "Macintosh HD" volume which would be something like "disk0s2" or perhaps "disk1s2".

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Answer 2

DonH49

Level 6

16,716 points

Jun 4, 2019 6:13 AM in response to alpha_gohan7435

if all else fails to try and your computer can run YOSEMITE. Its disk Utility will bring that SSD back to life.

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Disk Unmount error

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