He had tried to install Ventura on a Mac without that much space and received a prompt from the installer telling him he needed to free up at least 25 GB. Without Apple providing specs, I was curious where Charles came up with that 25 GB number, and he told me that it was from personal experience. In it, he says that Ventura requires 25 GB of free space and that its installer clocks in at 12.19 GB, suggesting that it would be safest to add those numbers and make sure you had at least 37 GB free. However, our old friend Charles Edge recently published the necessary details in Free Space Required for Modern macOS Upgrades. Unfortunately, Apple hasn’t published similar specs for either Monterey or Ventura. So what counts as “sufficient” space? In my previous article, I linked to the tech specs for Big Sur, in which Apple says that it could require up to 44.5 GB of available storage. Marc had to restore from backup to bring his MacBook Pro back to working order. Apple fixed that bug in macOS 11.2.1, but I was reminded of it when TidBITS reader Marc Heusser wrote to tell us that upgrading from macOS 12.6.1 Monterey to macOS 13.0.1 Ventura on an M1 MacBook Pro with insufficient free space resulted in errors that prevented the MacBook Pro from booting. Two macOS releases ago, I wrote “ Ensure Sufficient Free Space before Upgrading to Big Sur” (10 February 2021) to warn users that an installer bug could result in a Boot Recovery Assistant loop.
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