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Message: <blockquote data-quote="chas_m" data-source="post: 1558693">Those percentages are just theories, not actual proven rules. I'm a very strong advocate of keeping lots of free space available, but it's just ridiculous to say that the moment you install a 3TB hard drive in your Mac you now *need* to keep *at least* 450GB free for the machine to operate properly. That's just silly.The TRUTH of the matter is that the amount varies by what you do with the machine, but as a rule of thumb a good idea would be to keep 20GB or more available at all times, and more available if you're moving big files around a lot. There is no precise "percentage," and no universal amount. Just a reasonable suggestion that varies depending on usage.</blockquote>