Fix Huge System Data on Mac
Is macOS System Data consuming 50 to 150 GB of your drive? CleanYourMac Space reveals exactly what files are hiding behind Apple's mysterious "System Data" label and helps you safely clean them.
What is actually inside "System Data" on Mac?
In System Settings > General > Storage, macOS groups any file that is not an Application, Document, or Photo into a catch-all category called "System Data". It typically consists of:
Time Machine creates invisible local APFS snapshots on your internal SSD when an external backup drive is disconnected.
Xcode DerivedData, Docker raw VM disks, and npm/cargo caches in ~/Library are categorized under System Data.
Hibernation sleepimage files (/var/vm/sleepimage) and dynamic memory paging files.
How CleanYourMac Space Demystifies System Data
Squarified Treemap Visualization
Replaces vague storage bar charts with a real, navigable squarified treemap where every colored block represents an actual directory on your drive.
Trash-First Safety
Never breaks your Mac. System-critical OS files are strictly protected, and any file you clean is sent to macOS Trash first for easy recovery.
Find Large Hidden Files (>100MB)
Quickly filter by size to spot massive disk image .iso files, abandoned virtual machines, and uncompressed simulator archives in seconds.
Multi-Threaded Mach Kernel Scan
Traverses your entire 1TB or 2TB SSD in under 45 seconds using low-overhead native Swift 6 POSIX system calls.
Step-by-step guides
Prefer to do it by hand? These guides show the exact Terminal commands.
See what is inside your System Data.
Download CleanYourMac Space free to scan your storage, or unlock lifetime Pro for $19.99.