Other Volumes in Container, and why it looks like your disk is lying
Disk Utility shows Other Volumes taking hundreds of gigabytes. It is usually not lost space at all, and here is how to read what it is telling you.
- APFS
- Disk Utility
- Storage
Open Disk Utility, select Macintosh HD, and you will often see a large slice labelled Other Volumes. On a 512 GB machine it can read 200 GB or more, which looks alarming and sends people hunting for files that do not exist.
Most of the time nothing is wrong. The number is an artefact of how APFS reports space, and understanding it takes about two minutes.
What a container actually is
Under APFS your disk holds one container, and inside that container sit several volumes that all share the same pool of free space. A standard macOS install has five or so:
| 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 |
When Disk Utility shows you one volume, everything in the other four is grouped as Other Volumes. So the figure is not lost space. It is the rest of your own disk, viewed from the wrong seat.
Reading it correctly
This shows the container and every volume in it, with real sizes:
diskutil apfs listLook for the line reading Capacity In Use By Volumes. That is the honest total. Compare it against the physical store size on the line above, and the difference is your genuinely free space.
When it is genuinely large
Two things inside the container really can consume space and really are reclaimable:
- Local snapshots. Time Machine keeps them on the internal drive. They are counted in the container and are invisible in Finder.
tmutil listlocalsnapshots /shows them. - The VM volume, which holds swap. It grows under memory pressure and shrinks on its own. Leave it alone.
If snapshots are the answer, 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.
The short version
Other Volumes in Container is nearly always your Data volume seen from the system volume's perspective, plus snapshots. If you want to know what is actually filling the disk, ignore the container view entirely and look at the files.
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, chiefly the Data volume holding all your files, plus Preboot, Recovery and VM. It is not lost or wasted space. Disk Utility is showing one volume and grouping the rest under that label.
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.
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.