I rewatched "Johnny Mnemonic" today. The last time I watched it was probably ten years ago. It struck me as very funny today that Johnny, with a memory doubler, held a whole 160gb in his head.
I suppose that for 1995, that seemed pretty futuristic, but it's one of those cases where reality ended up surpassing science fiction by far. I think the movie takes place circa 2025. William Gibson was the writer, so it's not like some sci-fi hack came up with the number. He also wrote in some yet to be invented wetware tech for physical enhancements, so the memory is the one place he was really behind the curve, or alternately, the real world went bleeding edge rather quickly.
It probably really did seem futuristic back then. I think IDE drives of the time topped out at half a gig, if I remember right. I think it was also still the era where people (me included) thought, "What the heck would you do with a gigabyte of space!?!" Now I have no problem envisioning my need for a petabyte drive in five or so years.
Also funny, when they did the data dump to the web, they told everyone, "Turn on your VCRs and record this."