Sort all files by size and delete old large files. What Else Can I Do to Reduce System Data on Mac?.My hunch is that Apple does this on purpose to prevent users from deleting system files that could lead to serious issues. allow you to review the files based on size and type. I have no idea why “System Data” is greyed out while “Documents,” “Music Creation,” “Trash,” etc.

Although my Mac now has a decent amount of free disk space and I tend not to store large files on my Mac these days, I’m always wary of files that are taking up more space than they should. Questions like these may easily get to your head. Why does my Mac system require so much space? What does it contain? Is it safe to remove some of those system data files? How do I regain more storage space? Worse yet, you have no idea what’s included in “System Data” storage, because clicking the “Manage” button brings you to this System Information window… and the “System Data” row is greyed out. In the example above, the System Data takes an astonishing 232 GB of precious storage. To your surprise, you see a grey bar “System Data” that seems to occupy way more space than you think it should. My MacBook Pro “System Data” is taking a large amount of disk space

You try to figure out what’s taking up your disk space by clicking the Apple logo on the top-left of the screen, selecting About This Mac, and hitting the Storage tab.

Disk space on macbook pro