MacHow2 uses affiliate links. Please check our Advertising Disclosure for more info.

If you haven’t already updated to macOS Big Sur then make sure you have enough disk space before doing so.

If you don’t, it seems the installer can actually make your Mac unresponsive and your Mac hard drive can become corrupted.

The bug has been discovered by the Mr Macintosh site which found that in some cases, the Big Sur installer does not check whether your Mac has enough disk space to upgrade.

If your Mac hard drive doesn’t have enough space, the installation can lock-up your Mac and all of your data can be corrupted.

big sur updater bug

Typically the installation will seem to be running normally until they get the following error message:

An error occurred preparing the software update.

At which point you won’t be able to boot your Mac anymore.

Big Sur requires at least 35.5 GB of storage to upgrade but this doesn’t include the installer itself which requires a further 13GB.

So that’s close to 50GB of free storage to be on the safe side when updating to Big Sur.

We always strongly advise backing up your data before performing any kind of upgrade of macOS. The best solution is to backup to an external hard drive on your Mac.

The easiest way to backup a Mac with an external drive is using Time Machine which will instantly allow you to roll back macOS.

An external hard drive can also help you access the recovery tools on your Mac that are no longer accessible in macOS if the drive has corrupted.

You can also install Big Sur to an external hard drive and then access your Mac hard drive again.

There are also tools that can help you find large files on your Mac that may be hogging storage and recover disk space on your Mac before you upgrade.

Although Apple has not commented on the issue, it will almost certainly now be aware of it and the bug will likely be fixed in the next release of macOS Big Sur 11.3 which is currently in beta.

You May Also Like:

About The Author

Author

MacHow2 is devoted to helping you get the most of of your Mac. We're passionate about all things Mac whether it's helping users with software recommendations or solving technical problems. If you've got any comments about this article, get involved by leaving a comment below. You can also contact us directly using the contact form at the top of the site. Please note that in the interests of transparency, MacHow2 may sometimes receive compensation from link clicks or vendors.

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Subscribe to MacHow2!

Sign up to get reviews, tutorials and special offers on Mac software!

error:

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close