History of HDDs and Flash

To read these two articles from Computerworld, click on
Part 1 / CW@50: Data storage goes from $1M to 2 cents per gigabyte (+video)

Storage and memory costs through the years
(price per gigabyte)
(Source: John McCallum, IDC)

Part 2  / CW@50: Data storage comes into its own

HDD areal density
* This the year of commercial introduction, not necessary the year of lowest cost per bit for that technology
(Source David Laws, The Storage Engine, Computer History Museum)