cds or dvds will play even with library rfid things on them; have the dvd standards people shift to redundant coding such that people can put little press on dots with data on any cd or dvd
as these get their order of magnitude greater memory the redundant data standard that permits cute nifty hologram looking press on dots might be a beneficial thing
I know USB flash or photorecognition of codes is more au courant
this is rather like an idea here called the USB CD-- beanangel, Apr 28 2010random, halfbakery