"Mom, remember that old station wagon you gave me when I moved out? It was big, inexpensive, slow and it used a lot of gas, but it also held a ton of stuff and did eventually get me where I needed to go. That's your HD. An SSD is like a hybrid Porsche. It's tiny and expensive, and you can only take a couple of duffel bags with you when you go, but you get there a lot sooner and hardly use any gas. You'd still keep the station wagon around to carry large stuff, but you drive the Porsche every day."