thank you for replying.
but i think…. according my-self theory-
that the data simply write on a metalic plate in the codeing language….and that time the decoding also storing in that plate{ micro SD card/USB card}. when we wanat to remove that data.. use the decoding and they decode the data…and make nutralisation on the plate.
and the plate is ready to store new data. is it rong?