Since the inception of the hard disk drive:

• Capacity per HDD increasing from 3.75 megabytes to 4 terabytes or more, more than a million times larger.


• Physical volume of HDD decreasing from 68 ft3 or about 2,000 litre (comparable to a large side-by-side refrigerator), to less than 20 ml (1.2 in3), a 100,000-to-1 decrease.


• Weight decreasing from 2,000 lbs (~900 kg) to 48 grams (~0.1 lb), a 20,000-to-1 decrease.


• Price decreasing from about US$15,000 per megabyte to less than $0.0001 per megabyte ($100/1 terabyte), a greater than 150-million-to-1 decrease.


• Average access time decreasing from over 100 milliseconds to a few milliseconds, a greater than 40-to-1 improvement.

Wikipedia: http://en.wikipedia....i/Hard_disk_drive

More impressive, in some ways, than the advances in silicon.