My first computer, a TI 99, used cassette tapes to store data. My second computer used 5.25-inch floppy disks, and the third system had a combination of a 3.5-inch floppy drive and a small IDE hard drive. The next PC had a zip drive and a tape backup unit. However, as different as these disks were, they all used the same magnetic platter technology that's been popular since reel-to-reel tapes ruled the earth.
Today, solid state drives finally allow us to end the ancient practice of storing our data on spinning magnetic platters. Because they have no moving parts, SSDs are infinitely faster than hard drives and more durable, too. Today, the cost of solid-state storage is significantly higher than magnetic media, but expect that delta to shrink significantly over the years while users come to expect SSD speeds from even low-end computers. By the time my son gets his first new laptop, you won't be able to buy one without an SSD. Hard drives and their cheap storage will only remain useful for servers, where space is more important than speed.