Why My Mac Suddenly Ran Out of Space — And How I Freed 100GB in Minutes

🧩 The Problem

It started with a simple warning.

“Your disk is almost full.”

At first, I ignored it.

I have a 494 GB SSD, and I wasn’t storing any large files — no movies, no huge downloads.

But suddenly, my Mac started behaving strangely:

• Apps became slow

• Builds took longer

• Even Chrome started lagging

So I checked the storage…

👉 And I was shocked.

“System Data: 345 GB”

🤯 The Confusion

What is System Data anyway?

I didn’t install anything big.

No large apps. No heavy files.

Still, somehow most of my disk was gone.

macOS didn’t give any clear breakdown.

So I had to investigate manually.

🔍 The Investigation

I opened Terminal and ran:

du -h -d 1 ~ | sort -hr | head -15

And then… I found it.

137G /Users/mddelwar/.pm2

👉 A hidden folder was taking 137 GB

💣 The Real Culprit

The folder was created by PM2 — a tool I use to run Node.js apps.

Inside it?

👉 Logs. Lots of logs.

PM2 keeps writing logs continuously…

But it never cleans them automatically.

So over time, it silently grew to:

👉 137 GB 😐

⚡ The Fix (Took 5 Seconds)

To clear everything, I ran:

pm2 flush

And just like that…

💥 Over 100 GB of space was freed instantly

🛡️ Prevent This in Future

I installed log rotation:

pm2 install pm2-logrotate

pm2 set pm2-logrotate:retain 7

Now logs won’t grow uncontrollably anymore.

🧹 Bonus Cleanup (Optional)

While investigating, I also found other space-heavy folders:

• ~/Library → caches & app data

• .npm → package cache

• .gradle → build cache

You can clean them safely:

npm cache clean --force

rm -rf ~/.gradle/caches

rm -rf ~/.cache/*

🧠 Key Takeaways

• “System Data” is often misleading

• Hidden developer tools can consume huge space

• Logs are silent killers

• Always check hidden folders (~/.something)

🚀 Final Thought

If your Mac suddenly runs out of space…

👉 Don’t panic

👉 Don’t blame macOS

Instead, check this:

du -h -d 1 ~ | sort -hr | head -10

You might find your own 137GB surprise 😄