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Note that depending on the amount of purgeable space, the purging may take 2-10 minutes.Īlso please allow a couple of minutes afterwards, until the system recalculates the new amount of purgeable space. This feature is not available in the Mac App Store edition of DaisyDisk. With DaisyDisk you can forcedly reclaim the purgeable space by dragging the purgeable space item to the Collector, as you would do to delete a regular file or folder. For example, when you need to free up a certain amount of disk space to create a partition, or simply when something goes wrong and the purgeable space seems to get out of control. However, in certain cases, a forced purge may be necessary.

In most cases you don’t have to worry about it, and just let it be - it will be reclaimed automatically as needed. The purgeable space is there by design of macOS. This allows you to understand how much space is maximally available on a disk, at a glance. In disks overview, DaisyDisk includes the purgeable space into the free space, exactly as Finder does. Instead, DaisyDisk provides a macro-level view and deletion of the purgeable space.Īfter scanning, you can see the purgeable space when you expand the hidden space item.īefore macOS High Sierra, the main component of the purgeable space - the local snapshots of Time Machine - could be revealed in restricted folder at path `/.MobileBackups` after scanning as administrator. Starting from macOS High Sierra and APFS, the purgeable space is located outside of any scannable area, even with raised permissions. The system calculates the current amount of purgeable space asyncronously in the background, and often there can be a significant delay between your action and its effect on the purgeable space, from a few seconds to a few minutes.

Or else, when there is no deficit of free space, macOS allows the purgeable space to pile up to as much as 80% of disk’s capacity, by design.

When an application requests more disk space than is currently free, the system automatically and instantly reclaims the corresponding amount from the purgeable space. The purgeable space mostly consists of local snapshots of Time Machine, and also caches, sleep images, swap files and other temporary system files. When you check how much available disk space you have on your Mac, you’ll find that there’s a chunk of space that is not literally free, but is nevertheless available to applications. User Guide Purgeable space What is purgeable space