I remember going on a trip to the BASF chemical factory in Ludwigshafen, Germany. We went to see why Chrome Dioxide cassette tape was such a superior recording medium. At that time, there were stories in the scientific press that audio and data could be stored in "bubble memory". BASF said that this was a long way off. In this programme the prediction was that solid state memory with a capacity of 650MB might be around by 2014. It shows how difficult it is to predict the rapid advance of techology, since some of the high end iPads now have 128 GB of solid-state storage. The machine I'm using for this entry has 256 GB.