I do not think HD will ever fully be replaced in our life time. There tech might change but it be a while.
They have been around for 50 years and never had anything take them over. We have just been able to make them faster and bigger. For example look at Seagates 1TB drive they just released. That is using the vertical stacking technology and that just scratching the surfaces of what that tech can do.
Had drive also have been keeping pace with CPU, ram and other technology in how fast it is improving so it has some life in it.
Hell the only thing in computer that has failed to increase at the same rate at everything else has been the battery power. but that more due to the fact that the battery is pushing the physical limits of what can be put in that amount of space.
They have been around for 50 years and never had anything take them over. We have just been able to make them faster and bigger. For example look at Seagates 1TB drive they just released. That is using the vertical stacking technology and that just scratching the surfaces of what that tech can do.
Had drive also have been keeping pace with CPU, ram and other technology in how fast it is improving so it has some life in it.
Hell the only thing in computer that has failed to increase at the same rate at everything else has been the battery power. but that more due to the fact that the battery is pushing the physical limits of what can be put in that amount of space.