Huge Hidden Space In Daisydisk

 

Mar 11, 2020

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[Important update] DaisyDisk 4.10 adds support of APFS Snapshots

Ever since macOS Catalina was introduced, many Mac users noticed that their disks eventually get full without obvious reason. A quick scan in DaisyDisk typically reveals a big chunk of “hidden space“, which means the system is using more disk space than it’s possible to reveal by scanning, even with elevated permissions (scanning “as Administrator”).

The reason for this problem is that macOS is making temporary backups of the system, so called local snapshots, temporarily locking big amounts of disk space in an area of the disk that is fully opaque to the users. Eventually when the snapshots get transferred to the permanent storage, such as the Time Capsule, or as the snapshots become too old and get replaced by newer ones, macOS releases the disk space. However, the backup process is continuous and therefore there is always a certain amount of disk space that is locked by macOS for the snapshots.

This is how macOS Catalina works and it’s not supposed to even be a problem or require any maintenance from the user. However, in certain cases, you just need to free up the space urgently, and it’s quite confusing that you don’t have control over a big chunk of your disk.

Jan 05, 2011  - DaisyDisk now scans the local APFS snapshots and displays them inside the “hidden space” area. Now it’s much easier to deal with the hidden space, because the snapshots are often its largest component. You can now delete the APFS snapshots (DaisyDisk will generate a script which you paste and run in Terminal). Now i have big problem with free space on HD, only 38Gb. When i try free space on HD due transfer data on mobile disk, that HD-space goes into in hidden space. Space does not become free. If open App DaisyDisk then show me: MacOS 13,1Gb. However what if DaisyDisk also shows a large amount of disk space taken by “Hidden Space”. You won’t be able to see exactly which files these are, as macOS will not allow DaisyDisk access to those files. If you find yourself in this situation then the files taking up the space may in-fact be system “cache” files managed by macOS.

Only DaisyDisk is able to see there is 120GB of Hidden space but since I'm using the free trail I'm unable to see what that is. Here is what I've done so far. Dec 24, 2013  DaisyDisk shows all the other programs and things constituting 'system use,' as you put it, so I am just not really sure what the 'hidden space' is. DaisyDisc runs as user application, so it.

Mar 11, 2020 A quick scan in DaisyDisk typically reveals a big chunk of “hidden space“, which means the system is using more disk space than it’s possible to reveal by scanning, even with elevated permissions (scanning “as Administrator”). During this time, you may see 'still hidden' in DaisyDisk appearing unusually large. Later on, 'still hidden' will be converted into 'purgeable space', which you can either forcedly delete (in DaisyDisk) or let macOS delete it later upon need.

Thankfully, the new version of DaisyDisk (4.10) is making it much easier to reveal the macOS’ hidden space, and for the part that cannot be revealed – understand its internal structure and even provide tools to reclaim it by demand.

In particular, the new DaisyDisk cuts down the amount of hidden space by revealing some obscure system items such as non-linked content of the “firmlinked” Data volume (under /System/Volumes/Data), the virtual memory volume (under /private/var/VM) and some other.

Huge Hidden Space In Daisydisk 2017

Besides, DaisyDisk now shows a breakdown of the hidden space that includes the following items:

  • Purgeable space. (You can also see it in Finder and Disk Utility when you inquire info for a disk). This is an amount of disk space, as calculated by macOS itself, which includes the snapshots too. You can forcedly purge this space by deleting it in DaisyDisk.
  • [NEW] Snapshots. This is a list of the temporary snapshots, with their estimated sizes. You can forcedly delete any or all of them in DaisyDisk, with a simple drag-and-drop, as you’d do with regular files.
  • Other volumes. This is the remainder of the system volumes that are used internally by macOS.

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All in all, the new DaisyDisk is making a huge step to return you understanding and control of your disk on macOS Catalina, and probably provides the most exhaustive and informative view of your disk compared to any other disk utility. Mixtrack pro ii traktor mapping.

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The update is free of charge of the existing users. You can download it here. The full change log is here.