MY HDD size progression:

None (Apple IIGS 2.8mhz)
25mb (286 12mhz)
40mb (386 20mhz)
80mb (486 33mhz)
400mb (486 133mhz laptop)

From then on, I started upgrading drives to larger sizes (including the laptop), instead of sticking with the stock model, so the list becomes useless. I do remember my father talking about how 25mb was more than enough space for us and that we wouldn't need more. Then I got Wing Commander 2.