System Data
Also known as: Other storage, Other, System data iPhone
System Data (shown as "Other" on older iOS) is the catch-all storage category for caches, logs, Siri voices, system files, and temporary data that does not fit Photos, Apps, or Media. Most of it is reclaimable cache that iOS clears automatically when space runs low.
- Lives in Settings > General > iPhone Storage
- Mostly reclaimable cache, not personal files
- Cannot be deleted directly; shrinks indirectly
What counts as System Data
In Settings > General > iPhone Storage, the bar at the top breaks your storage into categories. System Data is everything iOS cannot neatly file elsewhere: streaming and app caches, Safari website data, logs, fonts, Siri offline voices, and partially downloaded updates.
It is normal for System Data to grow to a few gigabytes. It only becomes a problem when it balloons to 10–30 GB or more, which usually points to a runaway app cache or a stuck software update.
Is it safe to clear System Data?
You cannot delete System Data directly — there is no button for it. Instead, iOS purges reclaimable parts on its own when storage gets tight, and you shrink it indirectly: restart the phone, clear Safari cache, offload heavy apps, and remove a stuck iOS installer.
Nothing you lose this way is irreplaceable. Caches rebuild as you use apps again, so the trade-off is a slightly slower first launch in exchange for recovered space.