From the 78 Tours disc in H265 format today, how did we move from the materialized leisure system to today's dematerialized system? With the advent of high-speed Internet and the various storage media, we are witnessing the very disappearance of the CD or BluRay or any other media medium to make way for digital in the box. USB key, hard disk, network storage... Welcome to this new consumer era. But let us leave a trace for future generations and remind them how to start. Don't forget the pleasure of having a nice support when you are a fan. In this book you can learn about the history of audio and video in all its forms. Have a good time.