content: I personally doubt we will be able to. As it is, this is REALLY pushing the limit of physics. We might be able to store multiple bits per atom by messing with electron configuration or spin (IE, quantum computing), but storing data in any subatomic particle would require direct access to that subatomic particle, and other than electrons, we don't have that in a safe environment. Unless you want your home PC to double as a nuclear reactor, of course.