Interesting article on the ultimate limits of data storage capacities, in theory. Even electronic quantum holography seems absolutely humongous. What we can possibly pitch our hopes on in the near future is indeed the reducing costs of DNA storage - and assuming we solve some of its problems of slow access.
http://www.forbes.com/sites/quora/2013/05/22/can-data-storage-ever-reach-an-absolute-limit/
http://www.forbes.com/sites/quora/2013/05/22/can-data-storage-ever-reach-an-absolute-limit/
