well, Computers weren't so big in the 1980-1985, for example zx spectrum or commodore, but they were for home market and hard drives like that - I don't know if they were used by home users, they really were very expensive, even the ordinary 20-60MB HDDs were really expensive to have.. (much more expensive than the whole computer) Furthermore, the reading and writing speed was really slow and the sound made by it was also not silent.. I had a 40 MB HDD in my Amiga 500, and also had an 400 MB HDD for Amiga 500+ but I was still using floppy disks, those were the days, file systems weren't so good as they are now and they were slow and usually messed up when electricity disappeared and appeared.
Maybe those kind of storage were needed for NASA, which needed to store lots of graphics and information and etc. Games at those times did not take more than 1-2 floppy disks, if not counting the simulators on Silicon Graphics computers usually for the Army. A lot of whom used ROM to store information which you cannot delete or write, it was faster, or cartridges appeared to be useful too.
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