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Level 1

8 points

Trouble erasing disc

Hi, I'm selling my macbook air but when erasing the disk in prep it's failed.. Message says:

Erase process has failed ...

Unmounting disk

Couldn't open device. : (-69877)

Can you please help?!

MacBook Air 13″, macOS 10.15

Posted on Jul 9, 2020 3:25 AM

Top-ranking reply

Level 1

8 points

Posted on Jul 9, 2020 5:11 AM

From recovery mode? Yes.

Actually, I've sorted it now - the default format was Mac OS Extended, I just changed to APFS and it's all worked fine now.

Thanks for replying though and hopefully this helps someone else :-)

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