Apple MAC A bug corrupts data on a Mac when it...

A bug corrupts data on a Mac when it is updated to Big Sur

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Last November, while the world was discovering the new MacBook Air, Pro and mac M1 equipped with the M1 chip, Apple simultaneously launched a new version of its computer OS: macOS Big Sur. since its release a little over four months ago, this OS has been updated several times, it had several problems, particularly in terms of bluetooth and wifi connectivity, but also another storage problem, the latter not being still not resolved.

To fully understand the problem, here is a real life example of what can happen to a Mac user. On a product that has not yet been updated to macOS Big Sur, if the update is activated when the space to perform it is not available, the computer will delete data, in order to make the update. up to date possible. A problem that can be very disabling for people who do not necessarily make backups on hard drives, especially since the deleted data is not necessarily the largest or the most recent but seems to be chosen at random by the computer.

Many users have complained on various forums about this issue and it turns out that the macOS Big Sur installer does not check if the internal storage of the Mac has enough free space. When the system starts the update process, the Mac becomes unresponsive and the data may be permanently corrupted.

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Big Sur must have 35 GB available

Apple says upgrading to macOS Big Sur for the first time requires at least 35.5GB of available storage – and that doesn’t include macOS Big Sur’s 13GB installer. Unfortunately, even if your Mac does not have 35.5 GB of storage available, Mac’s automatic update system may perform the update anyway, keeping your data at risk.

If this were to happen, then the update process will work fine, but users receive the following message towards the end of the installation: “An error occurred while preparing to update the software.”

From this point on, the Mac will no longer start. According to information from Mr. Macintosh, at the origin of this discovery, this problem affects both the installer of macOS Big Sur 11.2, the stable version currently in place on Mac, but also the beta installer of macOS Big Sur 11.3. At the same time, it doesn’t affect updates if your computer already has Big Sur (like updating from macOS 11.1 to macOS 11.2).

Solutions ?

The best solution for people who do not have the available space and still want to perform this update is to make a total backup of the hard drive and then completely erase it and start the macOS update. We obviously hope that Apple will do what is necessary to make this problem go away with the release of macOS 11.3 which is expected in the coming weeks. The new version of the Mac OS will therefore have a lot to do with several problems to resolve. The connectivity of Macs running Big Sur is also a black point in the update from the Cupertino company.

– official

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