The goal here is to remove extra files (I’d aim for a few large apps that are easily reinstalled): Since we assume all TidBITS readers know enough to maintain regularly updated backups and would never consider initiating an operating system upgrade without at least one current backup, let’s say that you’re helping someone else who started the Big Sur upgrade without sufficient space or a backup. When that’s the case, you can just boot to macOS Recovery, erase the drive, reinstall macOS, and restore from backup. Of course, everything is easier if you have a backup, and you should always make a backup before upgrading your Mac. If you or someone you know ends up in the Boot Recovery Assistant loop after attempting to upgrade to Big Sur, there are various workarounds, depending on whether or not your Mac has a T2 chip and whether or not you have enabled FileVault. If you’re perturbed by this lapse, submit feedback to Apple. That would seem like an easy fix, but Apple apparently hasn’t addressed it yet. You can check manually by choosing Apple > About This Mac > Storage, but the problem is that the Big Sur installer itself fails to verify that it has enough space to complete the upgrade. If upgrading from an earlier release, macOS Big Sur requires up to 44.5GB of available storage. If upgrading from macOS Sierra or later, macOS Big Sur requires 35.5GB of available storage to upgrade. It also affects only Intel-based Macs since M1-based Macs ship with Big Sur, they’re never in a position of having to upgrade from an earlier version of macOS.Īpple is clear about how much space Big Sur requires, specifying it in the Big Sur tech specs: The problem affects only upgrades from an older version of macOS to Big Sur, not an update to a Mac already running some version of macOS 11. If you start the installation without enough free space, you can end up in a Boot Recovery Assistant loop that’s difficult to break. It turns out that you must have sufficient free space for the Big Sur installer to complete its work when upgrading from a previous version of macOS. Macintosh’s detailed research into problems with the Big Sur installer. That’s not to say that some people won’t have problems-no app or operating system is free of bugs-but most reproducible problems should be known.Īlas, one more such problem has become known, thanks to Mr. #1684: OS bug fix releases, Finder tag poll results, Messages identity verification, blocking spambots, which Apple services do you use?Įnsure Sufficient Free Space before Upgrading to Big SurĪs we continue to use macOS 11.2 Big Sur, we’re getting closer to saying that it’s safe for most people to upgrade to Big Sur from a previous version of macOS.#1685: Hidden secrets of the Fn key, Emergency SOS via satellite free access extended, RCS support in Messages, Rogue Amoeba icon evolution.#1686: Please support TidBITS, OS security updates, Apple services poll results, biking with an iPhone.#1687: Feature-rich OS updates, recovering from a crashing bug in Contacts, Zoom for Apple TV, how much do you use widgets?.#1688: Former Apple engineer on watchOS 10, Apple hardware testing tool, Stolen Device Protection, Apple Watch sales halted, smart TV privacy abuses.
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