
If you have multiple disks or partitions, choose your startup disk from System Preferences. You can choose which drive to use as your startup disk from the System Preferences. Your startup disk is the drive your Mac boots up from by default.

If you have multiple drives connected to your Mac - or if you split your drive into multiple partitions, as recommended for running beta software - only one of them is your startup disk. Normally there’s only one drive in a computer, so it holds all your documents and data as well - which is probably how it got filled up. What is my startup disk?įor those who don’t know, your startup disk is the hard drive in your computer that stores the operating software. But if you’d rather skip them, click here to jump straight to our instructions for deleting files when your Mac startup disk is full. It’s useful to know the answers to these questions before you start clearing space on your disk. You’ll find the answers to a few common questions about startup disks below. Let’s start by explaining what we’re talking about.

How much free space do I need on my startup disk?.


Why do I need free space on my Mac’s startup disk?.
