Looking at the storage use on my N7 a disproportionate amount of space appears to be used for Cached Data e.g. whilst Music appears limited to 6GB and Video / Pictures is currently 3.9GB, the Cached Data is 7.1GB (i) why is this? & (ii) if I empty it will there be consequences / can I do anything about it? I am starting to use some mapping apps, so wonder if these are the culprit?