When space is running short, macOS is supposed to start purging what’s reported as being purgeable, including old snapshots, but that doesn’t always happen when you’d expect it. But sometimes the figures given in the Finder don’t come close to those in Disk Utility or at the command line. When it’s working correctly, the amount given as purgeable represents space which is currently used by snapshots and other dispensible data. Most of the time, the Finder’s Get Info dialog returns reasonably reliable figures for used and free space on APFS volumes. This article explains what you can do when faced with that and similar problems. As a result, it may appear that an APFS volume or disk is full, and installers and apps may refuse to work despite there apparently being ample free space. This normally means that there are small discrepancies between different estimates of free and used space, but sometimes those seem huge. This is because there’s more to it than just the file system’s directories and file data. APFS is a more complex and dynamic file system than HFS+, in that there often isn’t a simple answer to how much free space there is on any given disk or volume.
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