![]() The container has a Capacity of 100 GB, with 94 GB Used and 6 GB Free, which is correct. Here, I used my free app Stibium to write two files each of 47 GB for a total of 94 GB. Then write large files to TestVolume1 to almost fill the container. In this case, I have named those two volumes TestVolume1 and TestVolume2. Although you can do this using a single partition including the whole of the disk, it’s simplest to repartition the disk with a relatively small APFS container, such as 100 GB, using Disk Utility.Īdd a second volume to your test container, also in plain APFS format. This is best performed on an external disk formatted in APFS, containing no other data. This demonstration provides a reproducible sequence to demonstrate them, and the confusion this causes in users. There are innumerable reports of that available space not being realised in practice, and of huge errors in reporting purgeable and available space. Hence, when declaring space available in a volume, macOS will usually give that currently free plus that designated purgeable. Should a file operation, such as copying a file to a volume, require more space than is currently free, then macOS is claimed to delete items deemed purgeable to augment free space and enable the operation to complete. Although Apple provides a conceptual guide to programming the file system, it hasn’t been updated for over four years and doesn’t cover macOS space management at all.Īt its heart is the equation (whose origin is obscure)Ĭapacity = Available + (Used – Purgeable) This space management is based on the concept of purgeable files, as mentioned in Disk Utility’s Help pages and discussed in detail here. This article demonstrates these in an edge case for clarity. Furthermore, information given to users is inconsistent across the Finder and Disk Utility, and appears riddled with bugs that only confound the user. These aren’t explained in any coherent way in user documentation, nor can I find any explanation provided to developers. MacOS superimposes additional space management features over APFS to make some file system contents purgeable when it runs short of free space. ![]()
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