Not only does the upgrade process inevitably fail, but your data on the disk can also get corrupted forever.Īlso read: MacOS 11.3 will make your iPad apps look better on your MacBook Macintosh)Īfter a great deal of investigation into the issue, the site found that the issue was occurring because the macOS Big Sur installer would begin the installation process without first checking if there was enough space left on the disk.

Updating between macOS 11 versions does not trigger the issue (Mr.