Samsung is shipping a 64GB "harddrive" for notebooks that is 1.8" inches. Yes it is too expensive for you and most of your friends. My guess, is that in 3-4 years it will be standard on laptops and perhaps desktops as the price point per megabyte drops and the extra gigs on your laptop become about as useful as those extra mega pixels on your camera. Vital for the pros, but diminishing returns for the rest of us.
Hard drives measuring capacity in terabytes will be used in in TiVo equivelants and other devices as cheap ways to manage "broadband" network spikes for video demand across IPTV networks, assuming live P2P isn't up to the job. That will be about 6-8 years out. Then things will most likely all be solid state inter connected devices. Hard Drives will be massive, cheap and used for distributed on demand back-ups and massive databases that don't need to have millisecond response times. The things closest to us (physically and datawise) will be solid state, the things at the edge of the (anthropically viewed) network in time and distance will still use harddrives.
Again physical devices disappear as "logic and bits take over."