macOS Big Sur was formally launched for all customers in November final 12 months, and since then Apple has launched updates with bug fixes and total enhancements. Nevertheless, as reported by Mr. Macintosh, Big Sur nonetheless has a severe subject that can result in data loss when customers attempt to improve a Mac to the most recent model of the working system without enough space accessible.

After noticing a number of stories from customers on the net, Mr. Macintosh came upon that the macOS Big Sur installer isn’t checking whether or not the Mac’s inner storage has enough free space. Because the system initiates the replace course of, the Mac turns into unresponsive, and data can be completely corrupted.

Apple says upgrading to macOS Big Sur for the primary time requires at the very least 35.5 GB of accessible storage — and this doesn’t embrace the 13 GB macOS Big Sur installer. Sadly, even when your Mac doesn’t have 35.5 GB of storage accessible, macOS will attempt to set up the Big Sur replace, and that’s when customers might lose all their data.

The replace course of appears to run completely, however customers get the next message close to the top of the set up:

An error occurred getting ready the software program replace.

From that time on, the Mac will not boot. Mr. Macintosh was in a position to verify that this bug impacts macOS Big Sur 11.2 installer and even macOS Big Sur 11.Three beta installer. On the identical time, this doesn’t have an effect on OTA updates from one Big Sur set up to one other (equivalent to updating from macOS 11.1 to macOS 11.2).

When you have a backup of your data, you can merely erase all the disk and reinstall macOS. Nevertheless, recovering data without a backup can be very troublesome.

With FileVault enabled, you’ve gotten to join your Mac to one other Mac through Goal Disk Mode in order to get well your recordsdata. If FileVault wasn’t enabled in your Mac, you can attempt to delete some recordsdata utilizing the Terminal app in macOS Restoration, which can enable macOS to full the replace course of efficiently.

Apple hasn’t commented on this bug up to now, however hopefully will probably be fastened with the ultimate launch of macOS Big Sur 11.3. You can learn extra particulars about this drawback on the Mr. Macintosh weblog.

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