Managing Your Mac’s Hard Drive
Modern MacBooks are incredibly fast machines, largely because they use high-speed Solid State Drives (SSDs) instead of older, spinning mechanical hard drives. However, this speed comes with a significant drawback: SSD storage is incredibly expensive. Most entry-level Macs ship with relatively small drives (often just 256GB or 512GB), meaning it is remarkably easy to accidentally fill up your entire computer with high-resolution photos, 4K video files, and large applications.
When your Mac’s storage becomes completely full, the operating system can no longer temporarily cache files, which leads to severe performance issues. Your computer will slow down significantly, apps will begin crashing unexpectedly, and you may even be prevented from installing critical security updates.
To avoid these problems, you should periodically check exactly how much free space you have remaining and identify which specific files are hogging the most gigabytes.
How to Check Your Free Storage Space
Apple provides a dedicated storage management menu that clearly breaks down exactly how your hard drive is being used.
- Click the Apple Logo in the top left corner of your Mac’s screen.
- Select System Settings (or About This Mac, then click the Storage tab if you are on an older version of macOS).
- In the left-hand sidebar, click on General.
- On the right side, click on Storage.
At the very top of this window, you will see a visual, colour-coded bar representing your entire hard drive.
Hover your mouse cursor over the different coloured segments of the bar. A small pop-up will appear telling you exactly how much space is being consumed by specific categories, such as Apps, Documents, Photos, macOS (the operating system itself), and System Data. Above the bar, it will clearly state exactly how much free space is currently available (e.g., “145 GB available of 512 GB”).
How to Quickly Free Up Space Using Built-in Tools
If you discover that your hard drive is dangerously full (less than 20GB remaining), you do not necessarily need to start manually deleting files one by one. The macOS Storage menu includes several automated “Recommendations” designed to help you quickly reclaim wasted space.
Look directly below the coloured storage bar. You will see a list of tools you can use:
- Store in iCloud: This feature automatically uploads all your high-resolution photos, desktop files, and old messages to Apple’s cloud servers. It keeps small, low-resolution thumbnails on your Mac to save space, only downloading the full original file when you actually try to open it.
- Optimise Storage: This tool automatically finds and deletes old Apple TV movies and TV shows that you have already watched. (You can always re-download them for free later if you want to watch them again).
- Empty Bin Automatically: Many users drag large files to the Bin but forget to actually empty it, meaning the files are still taking up space on the hard drive. Turning this on tells your Mac to permanently delete anything that has been sitting in the Bin for more than 30 days.
Manually Deleting Large Applications and Files
If the automated tools do not free up enough space, you will need to take manual action.
Scroll down further in the Storage menu, and you will see a detailed list of categories (Applications, Documents, Messages, Trash, etc.) with the exact gigabyte size listed next to each.
- Click the small ‘i’ (info) button next to any category—for example, Applications.
- A new window will open listing every single app installed on your Mac.
- Click the Size column header at the top of the list. This will sort the list, bringing the most massive, space-hogging applications to the very top.
- Identify large apps you no longer use (such as old video games or heavy video editing software).
- Select the app and click the Delete button at the bottom of the window to instantly remove it from your hard drive.
You can repeat this exact process for the Documents category to easily find massive, forgotten video files or old ZIP archives hiding deep within your Downloads folder.
