Startup. That is the drive your macOS is installed on and is
referred to as the startup disk. First, empty the trash. Then open
Finder and start looking at what else you may want to delete or move to
external storage. Look in Documents, your iTunes library, etc.
From E.T.'s Keyboard. . .
So now what? What is my starter disk, and where can I find it to delete
messages now that it is full?
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