You can follow the steps below to do:ġ) Click the Apple icon at the upper left corner, and click About This Mac.Ģ) Under the Overview tab, you can see the Startup Disk information. It’s rather easy and direct to check what your startup disk is. That is to say, your startup disk contains the operating system information, applications and user data. What is the startup disk?īy default, your Mac starts up from its built-in hard disk, but a startup disk can be any storage device that contains an operating system compatible with your Mac. If you’ve already known something about this, you can skip to the second part: ways to fix full startup disk. This part is about the information on the full startup disk warning. Clean up your Mac securely and automatically 1. The installation process will run, and once it’s done, you should boot into a fresh copy of macOS, with your files hopefully intact.If you’re a fan of Mac Pro/Air, you won’t be unfamiliar with the warning message: Your Startup Disk Is Almost Full.Īnd if you’re getting this full startup disk warning, don’t panic! This is a common error on Mac and you can fix the startup disk full error message easily.Ģ. You’ll have to agree to the terms of service and choose the drive to which you want to install. On the Recovery Mode splash screen, select “Reinstall macOS,” which will bring up the installer.

Still, it’s best to make a backup first, which you can do in Disk Utility without loading into macOS. This assumes, of course, that your drive is still working and isn’t completely corrupted, which may cause issues. Luckily, you won’t lose your files when reinstalling macOS, as it uses the same process as upgrading. However, if Disk Utility reports that it can’t fix some errors, it’s probably a good time to back up anything you can and replace your disk.

If often can fix more on the second run-through.

If Disk Utility wasn’t able to fix all your problems, you could try running it again. Disk Utility won’t be able to fix a failing disk.Īfter it’s done, try booting into macOS again.

(if you’re not already doing it) and replacing the disk. If the Disk Utility tells you that your drive is about to fail, take it seriously. The Recovery Partition on all Macs comes loaded with Disk Utility, which can run “First Aid” on a drive that may be corrupted, and attempt to fix some of the issues. Run First Aid From Your Recovery Partition

Your startup disk is almost full