Mac storage appears under System Settings and then General and then Storage. Apple describes System Data as the space used by all Apple and third party files outside the named categories. You free space by moving media and deleting what you can download again. Space returns only after you empty the Trash.
Your Mac reports a large gray area called System Data or Other and the startup disk fills up. You need to know what that area holds and which files you can remove.
This guide follows Apple Support. See free up storage space on your Mac.
How do You Check Mac Storage?
In macOS Ventura 13 or later open the Apple menu then System Settings then General then Storage. In earlier versions open the Apple menu then About This Mac then Storage.
Select More Info next to a category like Applications or Documents to manage it.
What is System Data on a Mac?
Apple states that System Data, called Other in earlier versions, measures the storage space used by all files from Apple and other vendors outside the named categories.
How do You Free up Space on a Mac?
- Empty the Trash. Apple states that space returns only after you empty it.
- Clear Downloads. Open the Downloads folder from the Dock or choose Go then Downloads in the Finder.
- Delete media you can download again. Music and movies you can stream need no local copy.
- Move large libraries. Transfer Photos or iMovie libraries to an external drive.
- Clean Mail. Choose Mailbox then Erase Junk Mail and then Erase Deleted Items.
- Delete old device backups. Remove old iPhone or iPad backups stored on the Mac.
- Uninstall unused apps.
- Compress files. Compress files you rarely open but still need.
Apple also lists removal of unneeded user accounts. Check the Users folder on Macintosh HD for leftover data afterward.
What About Safe Mode?
Starting your Mac in safe mode clears certain system caches. Apple states that macOS recreates them as needed. Restart normally to exit safe mode.
For Windows steps see how to free up disk space in Windows. For background on cloud copies see how cloud storage works.
Frequently Asked Questions
What is System Data on a Mac?
System Data is the storage space that system and app files use beyond the named categories. Earlier versions call it Other.
Where do I Check Mac Storage?
Open System Settings then General then Storage in macOS Ventura 13 or later.
Why does My Mac Still Show Low Space After I Delete Files?
Apple states that space returns only after you empty the Trash.
Is Safe Mode Good for Freeing Space?
Safe mode clears certain system caches. Apple states that macOS recreates them as needed.
Can I Move My Photos Library Off the Mac?
Yes. Apple lists moving large libraries like Photos or iMovie to an external drive.
Key Takeaways
- Mac storage sits under System Settings then General then Storage.
- System Data covers files beyond the named categories.
- Empty the Trash to get the space back.
- Move large libraries to an external drive.
- Safe mode clears certain caches that macOS recreates.
Sources and References
This guide follows Apple Support.
- Free up storage space on your Mac (Apple Support) support.apple.com