Over the range of 30-40 GB total VM boot disk sizes that I tested, free space therefore ranged from 11.19-21.91 GB. Each VM boot disk lost a further 2.95-3.68 GB, presumably in hidden containers. Space taken by the SSV ranged from 8.83-10.14 GB, but that was offset by differences in the “other volumes”, making me suspicious that Disk Utility was still struggling with arithmetic. Successesįor a basic Ventura 13.0 system, the typical total space taken on disk by the boot volume group is around 15.14 GB, although variation in individual volumes is greater. Although the details are a bit noisier, the numbers work out reasonably consistent. It appears the only way to discover how much space is required is by trial and error, with a series of Virtual Machines. The download itself consistently declares that it’s 2.53 GB at least that’s a start, if not a particularly helpful one. Although that eventually links to advice on how to free up disk space when the update fails because there’s insufficient free space, nowhere can I see any figures indicating what is sufficient. The obvious place to check first is Apple’s support information about the 13.x updates. It seems a fair and simple question, and an important for many users: how much free space do you need on your Mac’s startup volume to be able to update macOS Ventura, say from 13.0 to 13.1?
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