Factual error: The whole computer disc thing is extremely unrealistic. If Russia and the US only suspected Vinciguerra was behind Teller's abduction and had not infiltrated yet, how would they have any idea how the research data was stored, and how would they have an example of the media used? As for the size of the media, let's remember this was 1963. Even two years later, magnetic disc storage was still in its infancy. The most advanced computer storage drives with a capacity of 5mb were the size of a small refrigerator and weighed almost half a ton (e.g., the IBM 2311). Not exactly something you could carry around in your pocket.