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A full startup disk is something that every Mac user will experience. And luckily, it’s a problem that has many solutions. In this article, we’ll go over: • What is startup disk full? • How to find what's causing startup disk full?

• How to fix startup disk full? • How do I prevent startup disk full in the future? However, we also understand that some people are short on time and just want to fix startup disk full. So, if you’re not really interested in what it is and why it happens, just skip the next two sections and head to “”. Or, even better, if you’d like an automatic, long-term solution that’ll keep your startup disk clean, we’d highly recommend a utility called. It'll help you clean up gigabytes of disk space in just minutes (you can ).

Note: if you’re running macOS Sierra (or higher), it has a built-in option of Optimized Storage that is supposed to solve the problem of the full hard drive by moving files into the cloud. That's why when your disk gets full on Sierra you see a different message. By clicking 'Manage' you can open the menu and see what Optimized storage offers. However, it moves junk and useless files to the cloud together with your files, and eventually you end up paying for iCloud storage to store junk. So we still recommend getting CleanMyMac and actually dealing with extra files rather than simply moving them. Now, with all that said, let’s get into what exactly “startup disk full” means.

Understanding What “Your Startup Disk is Full” Means What is a startup disk? A startup disk, as taken from this, is a volume or partition of a drive that contains a usable operating system. Still confused? Let’s break it down for you. Your Mac hard drive consists of disks (or partitions). Each disk (or partition) has your Mac data on it, which consists of your operating system, applications, etc.

Most Mac users have just one disk but power users may have two or more. Let’s look at an example of a Mac with only one hard disk: • Your Mac's hard drive is 500GB.

• It has one 'disk' on it, so all 500GB of storage is on that disk. • The disk has an operating system (OS X El Capitan), and user data (apps, etc). • And since you only have one disk, this is your startup disk: all 500GB. A Mac with two disks will have the storage divided between them. The Mac drive with the OS on it is the startup disk while the other drive is just used for storage of files.

It’s possible to have multiple startup disks, but most Macs will only have one. Why is your startup disk full?

This is easy. It’s a lot like why is your fridge full?

Teac drivers for mac. There is no more space! Your startup disk is almost full and this is very bad news for any drive.

A hard disk should never get beyond 85% capacity (especially a startup disk) as you will experience slowness and errors the further you get above that mark. If your startup disk is full and you get a message of warning from your Mac, this is a serious indication that you need to free up storage immediately. What to do when your startup disk is full? So how do you fix your full startup disk? The same way you solve the problem of a packed fridge - you need to clear up space, of course. To make more space on your startup disk you will need to: • Delete files from your Mac.

• Move files to an external hard drive or cloud storage. • Or install a second internal hard drive on your Mac. So, now that we know what a startup disk is, we need to talk about how to fix it. Let’s take a closer look at your disk space to see exactly what is causing your startup disk to be so full. What’s Causing Startup Disk Full? Short version: Take a look under-the-hood of your Mac.