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#NEED MORE DISK SPACE AFS PITT UPDATE#
#NEED MORE DISK SPACE AFS PITT SOFTWARE#
#NEED MORE DISK SPACE AFS PITT PLUS#
#NEED MORE DISK SPACE AFS PITT SERIES#

Your Mac’s likely free space requirement for the boot container thus comes to around (40 + 10 + VM + snapshots + caches) GB, plus ‘real’ free space.īecause snapshots will normally be deleted when free space is getting dangerously low, you don’t necessarily have to include them in your allowance.

system temporary and cache files, which should come to no more than 5 GB or so.

On occasion these can rise above 5 GB, but that should be very unusual

macOS working files, such as those in the ~/Library/Trial folder.

You need to know the demands of your apps and your work using them

These vary very widely, and no single figure can be given.

snapshots, if using a backup utility such as Time Machine, which routinely makes volume snapshots of all those volumes it’s backing up.

To that, you should add an allowance for each of the following: To estimate how much space your Data volume requires from the boot container, you’ll need to know how much is needed for regular files. Various utilities show the other two, for example my free Mints. The figure shown in the Finder should now be equal to the first of those, and the same as that shown in Disk Utility.

Space available for opportunistic usage is the lowest of the three, and represents that readily available without removing anything.

This should allow for the deletion of temporary files, volatile caches, and most snapshots other than the signed and sealed snapshot on the System volume, from which your Mac is booted.

Space available for important usage is likely to be significantly more, as it represents how much space could be made free when it’s essential.

Free space is the difference between the total storage available on the disk, and that currently in use, and might come to 214 GB on a well-used 1 TB internal SSD.

The volume that you’re most in control of, Data, stores a mixture of different data, which are reflected in the three different estimates of free disk space:

#NEED MORE DISK SPACE AFS PITT SOFTWARE#

If your Mac has ample physical memory, then it should remain less than 50 KB, but could grow to 20 GB or more if the software running needs much more memory than is available. The size of the VM volume depends entirely on how much virtual memory is required during use. Together these volumes could require a maximum of around 40 GB at their peak. The System volume itself is just over 15 GB, and may require a bit more than that during updating.

#NEED MORE DISK SPACE AFS PITT UPDATE#

The more recent Update volume is very small between updates, but is used for preparation and staging of macOS updates, when it could reach 15 GB or more. Preboot and Recovery are both relatively small, and should total well under 5 GB even during updating. Thus, to work out how much free space that container (and the whole disk) needs, you need to consider how much could be required for each of those volumes, and add them together to give a total. As they’re volumes within the same container, they share the same free space. There are now six volumes grouped together in the container from which your Mac boots macOS. Thankfully, those additional containers are small, well under 10 GB in total, so don’t need to be taken into account here.

#NEED MORE DISK SPACE AFS PITT SERIES#

This is also different for the internal SSDs of M1 series Macs, which contain two additional hidden partitions/containers, which aren’t present in Intel Macs or external storage. Since Catalina, macOS boot disks have had a formal structure which greatly affects free space. To keep this as simple as possible, I consider only disks which will be formatted in APFS, and are primarily used with Big Sur or Monterey. The simple answer is that it depends, and here I try to explain some of the more significant things it depends on. This has become one of the most popular questions put to me since the arrival of APFS, whether in specifying internal storage for a new Mac, or when managing external disks.