Depends on the reader…If the reader is just “looking for” the UID , It doesn’t give a fuck about what data is on the chip.
If your reader is a phone, and you have a variety of NDEF datasets on it, your phone will deal with the first record, but you can still access the other records.
This kinda sorta explains it for you
indeed
As you are specificlly talking about a DESFire chip, they can also have applets written to the chip, they are handled differently again…
I would reccomend you just get yourself an xDF2 and see what you can creativly come up with, but dont forget to share 