Re: Ah, but
My first hard-disk was 20Mb, the size of a planet, and took about 90 seconds to spin up. It was in an ICL / Three Rivers Perq 1 from 1979/1980 - lovely machine 1024x768 resolution raster (black and white), running a graphical window manager - 1Mb of RAM, 1Mb 8" floppies.... the best graphics tablet I've ever used....
Bear in mind this machine predated the 1K ZX81 ... And no, I didn't get it until 1991 - Manchester Uni flogging off old kit, for £50 - I do believe they were over £100,000 new!