My Mac Said “System Data” Was Using 300 GB. Here’s How I Actually Cleared It.

I opened System Settings → General → Storage and stared at the screen for a second.

macOS: 47 GB. Fine.

System Data: 300 GB.

No delete button. No info icon. Just a giant mystery bucket eating my disk.

If you’ve hit the same wall: you’re not alone, and no — Apple doesn’t let you “delete System Data” from that screen. You have to find what’s hiding inside it and clear that yourself.