Here’s a short version, you should check out your Mac under the hood. A lot of Mac users own more than one disk drive. The data might be files, operating systems, applications, etc. Each partition (or disk) contains the data of your Mac device. This hard disk drive is composed of partitions (or disks). Your hard disk drive is contained in your Mac device. Are you still confused about what this means? Well, let’s put it into different understandable parts. Well, a startup disk is a partition or volume of a specific drive that is comprised, partly, of an operating system that is usable. So, first, we have to say what a startup disk is. Part I: What Is A Full Startup Disk Part II: First Tip To Cleaning Up Your Disk Drive Part III: Other 10 Methods To Help Clean The Mac’s Startup Disk Part IV: How To Prevent A Startup Disk To Becoming Full Part I: What Is A Full Startup Disk Thus, this article is going to tell you what is a full startup disk and how to fix it. What you need to do is to free up more space within your hard disk drive that contains the operating system. If your Mac states that your startup disk is full, you have a serious issue at hand. Plus, you will get errors like our problem right now, a startup disk is full. If this happens, your Mac device will slow down. It is recommended that your hard disk, especially your startup disk, should not have more than 85% of it occupied. When your startup disk is full, it means, it almost has no space within it. Why is your closet full? Well, it’s because no space is available within it.

Cleaning up startup disk on mac