memory is an essential issue for our society and for every one of us up to now various media have been used to store our memories and a wealth of information. the average life expectancy of an inscription on a stone is ten thousand years. on parchment it's a thousand years. on film one hundred. on vinyl fifty years. with computers our memory is facing an unexpected vulnerability some technologies have already disappeared this uncertainty is especially troubling because we evolve to to make everything digital believing our data would remain retrievable for a very long time yet not a single digital medium has managed to achieve long term success will we be able to ensure the survival of our digital data or is it doomed to disappear sooner or