Other Volumes in Container, and why it looks like your disk is lying
What Other Volumes in Container means in Disk Utility, why it looks huge, and what you can safely clear, with real volume sizes from macOS 27.
Other Volumes in Container is the space used by the other volumes that share your Mac's disk, shown when you select one volume in Disk Utility. It is almost never lost space. If you selected Macintosh HD, it includes Macintosh HD - Data, which holds every file you own.
What is Other Volumes in Container on a Mac?
Your Mac's disk holds one container, and several volumes sit inside it, all sharing the same free space. A standard macOS install has five:
| Volume | What it holds |
|---|---|
| Macintosh HD | The read-only system, sealed by macOS |
| Macintosh HD - Data | Everything of yours: apps, documents, downloads |
| Preboot | Files needed to start up and unlock the disk |
| Recovery | The recovery environment |
| VM | Swap and sleep image |
Disk Utility shows the volume you clicked on its own and puts the other four together under Other Volumes. The figure is the rest of your own disk, seen from one volume's seat.
Why is Other Volumes in Container so large?
Usually because Macintosh HD is selected, so the Data volume, with all your files, is counted in Other Volumes. Select Macintosh HD - Data instead and the number drops to the system, Preboot, Recovery and VM volumes, which is tens of gigabytes rather than hundreds.
When the number is large even with Data selected, two things are the usual cause: local Time Machine snapshots, which are counted in the container but invisible in Finder, and the VM volume, which grows when memory is tight.
How do I see what is in Other Volumes in Container?
This shows the container and every volume in it, with real sizes:
diskutil apfs listEach volume has a Capacity Consumed line. Capacity In Use By Volumes is the honest total, and Capacity Not Allocated is your genuinely free space. Then check for snapshots:
tmutil listlocalsnapshots /Can I delete Other Volumes in Container?
No, and you should not try. Those volumes are the sealed system, the startup files, the recovery environment and swap, and with Macintosh HD selected they include the volume holding your files. The only part you can safely reclaim is local snapshots, and macOS removes those with a command rather than by deleting a volume.
How do I free up space in Other Volumes in Container?
If tmutil listlocalsnapshots / lists snapshots, thinning them is the supported fix, and the commands are in the System Data guide, which covers the same ground from the storage bar's side. If there are none, the space is in your own files, so skip the container view and look at the files instead.
Common questions
What does Other Volumes in Container mean on a Mac?
It means the space used by the other APFS volumes that share your disk's container: with Macintosh HD selected, chiefly the Data volume holding all your files, plus Preboot, Recovery and VM. It is not lost or wasted space.
Can I delete Other Volumes in Container?
No, and you should not try. Those volumes include the sealed system volume, the recovery environment and the volume holding every file you own. The only genuinely reclaimable part is local Time Machine snapshots, which are removed with tmutil rather than by deleting a volume.
How big should Other Volumes in Container be?
It depends which volume is selected. On a Mac measured in October 2026 on macOS 27.0.1, the volumes added up to over 200 GB with Macintosh HD selected and about 33 GB with Macintosh HD - Data selected, on the same disk.
Why is my Macintosh HD volume so small?
Because macOS splits the install into a read-only system volume and a separate Data volume. Macintosh HD is the sealed system, which is a fixed size on every Mac. Everything of yours is on Macintosh HD - Data, which is the one to look at.