Now click on Manage, which will open up the System Information tool, and wait a few minutes while the Mac calculates the storage taken up by various folders. Click on the Storage tab to see how much free storage is available. This can be accessed by clicking on the Apple menu at the top left corner of the screen, and then on About This Mac. The easiest way to check what's taking up space on a Mac is by using Apple's inbuilt storage management tool. Related: Mac Slowing Down? How To Find Which Apps Are Using The Most Memory For instance, macOS Monterey needs at least 26GB of free space, while those upgrading from older releases need at least 44GB of storage to install the update. Apple's macOS system updates also need a fair bit of free space to be installed. It may also become impossible to download larger files. Apps that save temporary files on a Mac may begin to get sluggish when there isn't free space. While the Mac still remains functional, it can begin to slow down if there isn't enough available storage.

When a Mac's storage is close to full, Apple will begin displaying warning messages asking users to free up space.

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