Data storage and device capacities have always been somewhat nebulous in the Shadowrun rules. Sure, we had the “one minute of video takes up a megapulse” rule in SR3, but that has never stopped the debates over the exact “real life” size of the megapulse; how much text, how many pictures, and so on. Now, we measure in gigapulses, and don’t really have to worry about it anymore.
According to science fiction writer Charles Stross, throw a grain of sand in your computer and you’re pretty much set for life. Well, eventually. But hey, Shadowrun is eventually, isnt’ it?