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Check categories before assuming files are missing
Open System Settings > General > Storage, or on older macOS versions, About This Mac > Storage. Look for a large category such as Applications, Documents, Photos, or System Data. “System Data” is a broad label for items that do not fit more specific categories; it does not identify one folder you should delete.
Look in places that are easy to overlook
- Review Downloads for old installers, archives, and exported files.
- Check large app libraries, such as photo, music, video, or creative-project libraries, from within the app that owns them.
- If you back up an iPhone or iPad to this Mac, check whether older backups are still needed.
- If other people use accounts on this Mac, ask them to review their own files.
- Check whether large files are downloaded locally from cloud storage or streaming apps.
Inspect a folder, not a mysterious system label
Mac Disk Space Helper can scan a folder you choose and show its largest folders and files. For example, you can choose your own home folder or Downloads. It cannot explain every item included in System Data, and its read-only scan does not delete or move files.
Do not remove files from hidden Library or System folders just because their names look unfamiliar. If the storage overview remains confusing, see why System Data can look large.
Check whether the reading changes
After removing something you have identified and no longer need, allow macOS time to recalculate the storage overview. If the available space does not change, restart and check again.