Large hard drives

It's hard to believe that computer manufacturers can now make a 1tb hard drive. It wasn't long ago that a 1GB hard drive was the talk of the town but computer makers are always coming up with something new so it's difficult to stay abreast of all the new technology. I haven't been able to fill this 70GB hard drive sitting inside this laptop. It's only half full so I'm not sure when i will ever need a 1tb hard drive. Today's hard drives are so efficient in performance and speed and they will only get better as technology evolves