Your hard drive should never get more than 85 percent full, especially when it is a startup disk. When your startup disk is full you will experience lower performance on your Mac. Aside from this window popping up in the most inopportune moment, such as when you're backing up your iPhone or saving a document that you have been working on. ![]() To make more space available on your startup disk, delete some files. How to create a bootable macOS High Sierra installer drive Put the macOS High Sierra installer on an external USB thumb drive or hard drive and use it to install the operating system on a Mac. Understanding what 'startup disk is full' actually means is the first important step before you can fix this issue. ![]() ![]()
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