# Lost Storage After the macOS 27 Update? Here's Why

> After upgrading to macOS 27 Golden Gate, free space often drops. What took it, what comes back on its own, and what you can safely reclaim.

- Published: 2026-10-10
- Updated: 2026-10-10
- Author: @cemali (https://www.linkedin.com/in/cemaligencer/)
- Topic: Storage
- URL: https://fresh.ist/blog/mac-storage-after-macos-27-update/

**TL;DR:** After the macOS 27 Golden Gate upgrade, free space usually drops for three reasons: temporary update files and a pre-update snapshot, background re-indexing, and Apple Intelligence models. Apple lists up to 14 GB for the models on some Macs. Wait 24 to 48 hours for the temporary part to clear, then check System Settings › General › Storage before you delete anything.

*Written for macOS 27.0 Golden Gate on Apple silicon Macs.*

Apple released macOS 27 Golden Gate on September 14, 2026, and a lot of people noticed the same thing right after upgrading: much less free space than before. For some, the drop was big enough to trigger low-storage warnings.

Part of that space comes back by itself. The rest can be explained, and some of it you can reclaim safely. The order matters here: wait first, then look, and delete only once you know what you're deleting.

## Key takeaways

- Some of the drop is temporary. Update files, a pre-update snapshot and re-indexing usually settle within 24 to 48 hours.
- Apple Intelligence models are the biggest lasting change. Apple lists up to 14 GB on Macs with M3 or later and at least 12 GB of memory, and up to 8 GB on other supported Macs.
- System Settings has no button that deletes the AI models, and turning features off doesn't reliably give the space back.
- The space you can reclaim yourself is usually in installers you kept, old device backups and app caches.
- Deleting system folders is not a way to get space back after an update.

## Why does the macOS 27 update use so much space?

Three things take the space, and each behaves differently.

**1. Temporary update files and a safety snapshot.** Apple advertised the upgrade download at about 30.8 GB. The installer needs that download plus working room. Since macOS High Sierra, Apple has also saved a local Time Machine snapshot before installing any macOS update. Apple says your Mac counts snapshot space as available storage and removes snapshots when space is needed or after 24 hours.

**2. Re-indexing and housekeeping.** After a major update, macOS rebuilds indexes and caches in the background. Spotlight and Photos are typical examples. While that runs, it takes up space and your Mac feels busier than usual.

**3. Apple Intelligence models.** Apple's next generation of Apple Intelligence requires macOS 27. Apple's own figures are up to 14 GB of on-device storage for Macs with M3 or later and at least 12 GB of unified memory, and up to 8 GB for other supported Macs. Independent reports show higher numbers in Storage settings, often 20 to 30 GB. Apple hasn't said whether its figure is measured the same way as the Storage readout.

The Eclectic Light Company tracked a Mac mini through the upgrade, and its numbers show the pattern clearly. Used space peaked about 150 GB above its previous level 24 hours after the upgrade. It then fell back, but stayed about 30 GB higher than before. Storage settings reported about 29 GB for AI components on that Mac. Your numbers will be different, but the shape (a big spike, then a smaller lasting increase) is common.

## Should I wait before cleaning up?

Yes. Give your Mac **24 to 48 hours** after the upgrade before deciding anything. In the meantime:

- Keep it plugged in and awake for a while so background indexing can finish.
- Restart it once to clear some temporary files.
- If you use Time Machine, let it run a normal backup so pre-update snapshots expire on schedule.

Then look again. A day later, the "where did my space go?" question has often answered itself.

## How do I see what's taking the space now?

1. Choose **Apple menu › System Settings**, click **General** in the sidebar, then click **Storage**.
2. Wait for the bar to finish calculating, then hover over each segment. Look for **Apple Intelligence** (if listed), **macOS**, **System Data**, **Applications**, and **iOS Files**.
3. Click the info button next to Applications, Documents, iOS Files, and Trash to see the largest items.
4. To check for leftover snapshots, open Terminal and run this read-only command:

```bash
# Lists local Time Machine snapshots on the startup disk (read-only)
tmutil listlocalsnapshots /
```

5. Look in `/Applications` for an app named **Install macOS Golden Gate**. If you downloaded the full installer yourself and kept it, it can take a lot of space. You can delete it if you don't need it for a bootable installer.

If System Data is the big one, see [what is System Data on Mac?](/blog/what-is-system-data-on-mac/) for a breakdown. If caches turn out to be a large share, our [cache guide](/caches/) covers which cache folders are safe to clear.

## What about Apple Intelligence: can you turn it off?

Apple's macOS 27 guide explains how to turn off or restrict individual features. There's no single master switch:

- **Siri AI:** System Settings › Siri › Turn Off Siri. You can then turn Siri back on and choose **Use Siri Classic**.
- **Notification summaries:** System Settings › Notifications › Summarize Notifications.
- **Summaries in Messages and Mail:** in each app's Settings.

Turning these off stops the features from running. Apple doesn't say it removes the model files, and owners report that the Storage figure doesn't reliably drop. **If you're after disk space, these switches probably won't get it back.**

You may come across scripts online that delete AI model folders. The models are system-managed assets, and we don't recommend deleting them by hand or disabling system protections to get at them.

## What can you safely remove after the update?

| Item | Typical size | Safe to remove? | How |
| --- | --- | --- | --- |
| Pre-update local snapshot | Varies | **Let it expire.** macOS removes it | Wait 24 hours, or use Apple's Time Machine method below |
| Temporary update files | Varies | **Let macOS handle it** | Restart and wait 24 to 48 hours |
| Full installer app you kept | Tens of GB | **Yes**, if you don't need a bootable USB | Drag "Install macOS Golden Gate" to the Trash |
| Old iPhone/iPad backups | Can be large | **Yes**, if you have a newer backup | Finder › your device › Manage Backups |
| App caches | Varies | **With care** | Quit the app, then remove its folder in `~/Library/Caches` |
| Apple Intelligence models | Up to 8 to 14 GB per Apple; often more in reports | **Not from Settings** | No supported way to delete them by hand |
| Re-indexing data (Spotlight, Photos) | Varies | **No** | Let it finish |
| `/System` and system assets | n/a | **Never** | Leave alone |

**To clear local snapshots sooner,** Apple's method is to open **System Settings › General › Time Machine**, click **Options**, set **Backup Frequency** to **Manually**, wait a few minutes, then set it back. Don't leave automatic backups switched off.

**To remove old device backups,** connect the iPhone or iPad, select it in the Finder sidebar, click **Manage Backups** on the General tab, right-click an old backup, and choose **Delete**.

**Then check the usual places.** Your Downloads folder, apps you no longer use (see [how to uninstall apps completely](/blog/uninstall-apps-mac-completely/)), and developer caches are often worth more than anything the update added.

## What not to do

- **Don't delete folders in `/System` or `/System/Library/AssetsV2`.** macOS downloads and removes these assets itself.
- **Don't disable System Integrity Protection** to remove AI models.
- **Don't panic-clean on day one.** A good part of the drop goes away by itself.
- **Don't switch off Time Machine permanently** to get rid of snapshots. Turn it back on.
- **Don't downgrade just for disk space.** It means erasing and restoring, and the space is easier to find elsewhere.
- **Don't trust "free 50 GB now" promises.** No tool knows what it can free before it scans.

## A before-and-after view, if you want one

To see exactly which folders changed, a disk treemap helps: scan before and after cleaning and compare. Freshist's Analyze view is one option. It's hardlink-aware, so files aren't counted twice, and its cleaner lists every item and moves it to the Trash. Scanning is free. See the [help docs](/help/) or [how it compares](/compare/).

## Related guides

- [What is System Data on Mac?](/blog/what-is-system-data-on-mac/)
- [Mac cleaner without a subscription: what to check](/blog/mac-cleaner-without-subscription/)
- [MacBook fan loud or running hot? What's normal](/blog/macbook-fan-loud-running-hot/)
- [How to completely uninstall apps on Mac](/blog/uninstall-apps-mac-completely/)

## Sources

- Apple Support: [How to get Apple Intelligence](https://support.apple.com/en-us/121115) (storage requirements)
- Apple Mac User Guide: [Turn off or restrict access to Apple Intelligence](https://support.apple.com/guide/mac-help/turn-restrict-access-apple-intelligence-mchlb2e44f94/mac)
- Apple Support: [About Time Machine local snapshots](https://support.apple.com/102154)
- Apple Mac User Guide: [Change Storage settings on Mac](https://support.apple.com/guide/mac-help/change-storage-settings-on-mac-mchl3d437fbc/mac)
- Apple Support: [Free up storage space on your Mac](https://support.apple.com/en-us/102624)
- Apple Support: [Locate backups of your iPhone, iPad, and iPod touch](https://support.apple.com/en-us/108809)
- The Eclectic Light Company: [How did Golden Gate affect free disk space?](https://eclecticlight.co/2026/09/18/how-did-golden-gate-affect-free-disk-space/)
- The Eclectic Light Company: [Apple has released macOS Golden Gate](https://eclecticlight.co/2026/09/14/apple-has-released-macos-golden-gate-and-security-updates-to-tahoe-26-7-sequoia-15-8/)
- MacRumors: [Here are the Macs compatible with macOS Golden Gate](https://www.macrumors.com/2026/06/08/macs-compatible-macos-golden-gate/)

## Frequently asked questions

### How much storage does macOS 27 Golden Gate take?

Apple advertised the upgrade download at about 30.8 GB, but the installed footprint varies by Mac. Apple lists Apple Intelligence at up to 14 GB on Macs with M3 or later and at least 12 GB of memory, and up to 8 GB on other supported Macs. Some owners report higher figures in Storage settings.

### Why did my free space drop right after updating?

During and after the upgrade, macOS keeps temporary update files, saves a Time Machine snapshot before installing, and re-indexes your disk. Much of that is cleared on its own within a day or two.

### Can I delete Apple Intelligence models to free space?

Not from System Settings. Apple's macOS 27 guide explains how to turn off individual features, but it doesn't describe a way to remove the model files. Don't delete system asset folders by hand.

### Can I go back to macOS 26 Tahoe to get the space back?

Downgrading means erasing your Mac, reinstalling the older macOS, and restoring from a backup made before the upgrade. That's a lot of work for some disk space. Try the steps in this guide first.

### My Intel Mac didn't get macOS 27. Is this relevant to me?

macOS 27 requires a Mac with Apple silicon, so Intel Macs stay on macOS 26 Tahoe, which continues to get security updates. The general advice still applies after any large Tahoe update.

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Canonical page: https://fresh.ist/blog/mac-storage-after-macos-27-update/
Official site: https://fresh.ist/ (fresh.ist only)
Generated: 2026-10-10