The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
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
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 :-)
Are you erasing from the Recovery partition?
Trouble erasing disc
