It was reported last week that MacOS Big Sur has a serious issue that could lead to data loss when users try to upgrade a Mac to the latest version of the operating system without enough space available. Apple finally solved the problem with a new build of macOS Big Sur 11.2.1, which takes a good look at whether the disk has the necessary space before starting the upgrade process.
Mr. Macintosh first reported that several users received an error message when they upgraded a Mac to MacOS Big Sur, causing the Mac to restart – and the only solution was to delete some files from the internal disk via the Target Disk mode (which does not work for some models) or to wipe the entire disk clean.
Apple says that 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, MacOS will try to install the Big Sur update even if 35.5 GB does not have memory available, and then users may lose all their data.
Apple has quietly released a new version of macOS Big Sur 11.2.1 (20D75) that allows users to no longer upgrade the operating system without enough space available. Unfortunately, the Macs that got stuck after starting the MacOS Big Sur installation do not seem to be recovering.
If you have encountered this issue after trying to install MacOS Big Sur on your Mac, you can follow the detailed instructions provided on the Mr. Macintosh blog to recover your files or at least get your Mac up and running again after cleaning up macOS.
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