It was reported last week that macOS Big Sur has a serious problem that can result in data loss when users try to upgrade a Mac to the latest version of the operating system without enough space available. Apple finally fixed the problem with a new build of macOS Big Sur 11.2.1, which correctly checks that the disk has the necessary space before starting the update process.
Mr. Macintosh first reported that several users were receiving an error message when upgrading a Mac computer to macOS Big Sur, which caused the Mac to no longer boot – and the only solution was to delete some files from the internal disk via destination disk (which does not work for some models) or to clean the entire disk.
Apple says upgrading to macOS Big Sur for the first time requires at least 35.5 GB of available storage – and that does not include the 13 GB macOS Big Sur installer. Unfortunately, even if your Mac doesn’t have 35.5 GB of available storage, macOS will try to install the Big Sur update, which is when users can lose all of their data.
Apple has quietly released a new build of macOS Big Sur 11.2.1 (20D75) that no longer allows users to update the operating system without having enough space available. Unfortunately, this does not seem to fix the Macs that crashed after the macOS Big Sur installation started.
If you were affected by this problem after trying to install macOS Big Sur on your Mac, you can follow the detailed instructions shared on Mr. Macintosh blog to recover your files or at least get your Mac back up and running after doing a clean install of macOS.
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