[header] How to free up space on a mac [title] Open your movies folder. [step] Find anything that seemed cool at the time but is now just a waste of valuable hard disk space. Since videos take up a lot of space, move any unwanted video to the trash. 
[title] Go to the music/itunes folder. [step] These are your itunes movie files, and if you got them from youtube or another video site, they take up space.