And this is Phil Schiller, 10 years later. He's about to reveal a revolutionary design of Apple's new $3,000 Mac Pro that looks a lot like a trash can. Phil Schiller: Can't innovate anymore ...

Meddling with the system cache is particularly risky. When you are finished and satisfied, right-click the Trash can icon in your Mac’s Dock and select Empty.

Freeing up storage space on your Mac isn't too tough for the most part, but you may have noticed "System Data" taking up a ...