How much memory do I need for my hard drive?
If you haven't worked with computer hardware before, it can be easy to confuse your hard drive with memory. However, your hard drive is not the same thing as memory or RAM. You can think of your hard drive as being like a filing cabinet. It's a good place to store a lot of information for a long time. Your RAM (or memory) is kind of like the top of your desk. This is where your system stores the information you're currently working on.
RAM is about 100 times faster than your hard drive. However, your hard drive can store information after the power is turned off, while RAM cannot. Your system needs both memory and a hard drive to operate properly.