If these are personal (and therefore, precious) files that cannot be deleted, other things have to go. We find that the largest amounts of data are in our customers’ iPhoto, iTunes, and movie libraries. Trash those movies you watched a year ago and hated, but that are still taking up precious space on your hard drive. The slower machine may stress you out as well! Clear out some space by trashing old versions of application installers you’ve been keeping in your Downloads folder. Running with a full hard drive is dangerous because it stresses out the operating system which stresses out the hard drive. If it approaches being full, the operating system struggles to find space to. Your hard drive is where everything on your computer: the operating system, your applications, and your personal files are stored.
Not enough hard drive space available. Quit the programs you are not using or restart your computer. RAM is emptied when you quit out of those files or applications or when you shut down or restart the computer. RAM is where open files and applications are stored. What it indicates may range from there being: However, if you notice the beachball appearing more often than usual, or sticking around for longer than usual, preventing you from clicking until it is done, or appearing during actions that it didn’t used to appear with before, your computer might be trying to tell you something. Actions such as opening that massive iMovie project you have been crafting for six months (I hope you have been keeping up with your backups!), or when you first start Photoshop with all those fancy plugins may predictably cause your computer to pause. Occasional sightings of this cursor are harmless, and may be considered normal. It means busy or in progress but is commonly known as the spinning beachball. The third icon occurs when OS X is ‘thinking’: Clicking and holding the mouse button within the text and then dragging will selects a word, a row, or rows of text that you can delete, type over, copy, or make bold or italic, etc. In Pages or Word, or anywhere else you can enter or select text, hovering over said text will change the cursor to this cursor. You can also minimize, maximize, or close this window by hovering over the top left corner. With this cursor, you can click on the names of items to change them or click and hold these items to move them. Move your mouse right now and notice how it stays a black arrow until it is over something that has a special function. This cursor is universal such that you shouldn’t even notice it is there. Let’s start with the common standard cursor or arrow pointer: Understanding the six common cursor types described below should improve your confidence in file-management and navigation. This is how you interact with your computer. 
When you move the mouse, (or your finger on the trackpad), you control a cursor on the screen.
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