A Brief History of the Hard Disk

Hard disks are one of the most important and also one of the most interesting components within the PC. They have a long and interesting history dating back to the early 1950s. Perhaps one reason that I find them so fascinating is how well engineers over the last few decades have done at improving them in every respect: reliability, capacity, speed, power usage, and more.

This excellent chart shows the evolution of IBM hard disks over the past 15 years. Several different form factors are illustrated, showing the progress that they have made over the years in terms of capacity, along with projections for the future. 250 GB hard disks in laptops in five years? Based on past history, there's a good chance that it will in fact happen! Note that the scale on the left is logarithmic, not linear, and PC hard disks have one actuator.