The Bekenstein bound? A maximum number of bits can be placed on the surface of sphere. Beyond that it turns into a black hole. Mind you, one or two other pr

The Bekenstein bound? A maximum number of bits can be placed on the surface of sphere. Beyond that it turns into a black hole. Mind you, one or two other practical limits might come into play before a memory chip hits that one. :-) [1] https://en.wikipedia.org/wiki/Bekenstein_bound https://en.wikipedia.org/wiki/Bekenstein_bound --- Edit: The maximum information capacity of a radio antenna is limited by the surface area enclosing the antenna. One could theorise that that in addition to a maximum density of information storage there will also be a limit on the error free rate at which information can be sent to/from a storage system system, probably related to the surface area enclosing the system.