From Asimov’s Foundation’s Edge (if you haven’t done it already, go get the full series and read them!):

“With this I am,” Pelorat said and held up a square wafer about twenty centimeters to the side and encased in a jacket of silvery plastic. Trevize was suddenly aware that Pelorat had been holding it since they had left his home, shifting it from hand to hand and never putting it down, even when they had stopped for a quick breakfast.

“What’s that, Professor?”

“My library. It’s indexed by subject matter and origin and I’ve gotten it all into one wafer. If you think this ship is a marvel, how about this wafer? A whole library! Everything I have collected! Wonderful! Wonderful!”

We’re almost there: we can now have a whole library in less than that and even have a display embedded to access it. Now, regarding the means to build it, fully index it and cross-reference it, we’d need first to modify crazy copyright durations, wipe off DRM from the face of Earth and get some real eBook standards on board to allow content intercommunication.

Having gravitic engines powered, pocket cruiser class spaceships would be nice too.