How I Reclaimed 90GB of "System Data" on my Mac (The Data Engineer Way) 💻🚀 If you're a developer or data engineer on macOS, you know the "System Data" nightmare: a massive, mysterious 100GB+ bar that you can't click on or easily clean. I just dropped my System Data from 136 GB down to 47 GB. Here is the step-by-step "investigation" I used to hunt down the bloat: 🕵️ Step 1: Identify the "Big Fish" Don't guess. Use the Terminal to find exactly where the GBs are hiding: du -sh ~/Library/* | sort -rh | head -n 10 (This showed me my Library was the main culprit, specifically Group Containers and Application Support.)
🐳 Step 2: Tame the Docker Beast Docker creates a massive virtual disk (Docker.raw) that can grow to 60GB+ and stay there forever. The Fix: Use docker system prune -a --volumes or manually clear ~/Library/Containers/com.docker.docker.
🛠️ Step 3: Purge Developer "Derived Data" Xcode and other IDEs dump build files into hidden folders. The Fix: Wipe ~/Library/Developer/Xcode/DerivedData. It’s safe—the system just rebuilds it when you actually run a project.
🌐 Step 4: Trim the Browser "Brain" My Google Chrome folder was sitting at nearly 12 GB. Over time, site data and caches turn into a mountain of small files. The Fix: A deep "Clear Browsing Data" (All Time) or a manual trim of ~/Library/Application Support/Google.
📟 Step 5: Force the "Truth" (Re-indexing) The macOS storage bar often "lies" because the index gets stuck. If you've deleted files but the bar hasn't moved, force a re-scan: sudo mdutil -E /
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If you're a developer or data engineer on macOS, you know the "System Data" nightmare: a massive, mysterious 100GB+ bar that you can't click on or easily clean.
I just dropped my System Data from 136 GB down to 47 GB. Here is the step-by-step "investigation" I used to hunt down the bloat:
🕵️ Step 1: Identify the "Big Fish" Don't guess. Use the Terminal to find exactly where the GBs are hiding: du -sh ~/Library/* | sort -rh | head -n 10 (This showed me my Library was the main culprit, specifically Group Containers and Application Support.)
🐳 Step 2: Tame the Docker Beast Docker creates a massive virtual disk (Docker.raw) that can grow to 60GB+ and stay there forever.
The Fix: Use docker system prune -a --volumes or manually clear ~/Library/Containers/com.docker.docker.
🛠️ Step 3: Purge Developer "Derived Data" Xcode and other IDEs dump build files into hidden folders.
The Fix: Wipe ~/Library/Developer/Xcode/DerivedData. It’s safe—the system just rebuilds it when you actually run a project.
🌐 Step 4: Trim the Browser "Brain" My Google Chrome folder was sitting at nearly 12 GB. Over time, site data and caches turn into a mountain of small files.
The Fix: A deep "Clear Browsing Data" (All Time) or a manual trim of ~/Library/Application Support/Google.
📟 Step 5: Force the "Truth" (Re-indexing) The macOS storage bar often "lies" because the index gets stuck. If you've deleted files but the bar hasn't moved, force a re-scan: sudo mdutil -E /
The Final Result? ✅ 90 GB of SSD space reclaimed. ✅ A much snappier Mac for my data engineering workflows.
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