You searched for: “eeprom
electrically erasable programmable read-only memory, EEPROM
1. A method of storing data on microchips.

Usually bytes can be erased and reprogrammed individually.

RFID tags that use EEPROM are more expensive than factory programmed tags, where the number is written into the silicon when the chip is made, but they offer more flexibility because the end user can write an ID number to the tag at the time the tag is going to be used.

2. A form of read-only memory which can be electrically erased and reprogrammed.
3. An integrated-circuit memory chip that has an internal switch to permit a user to erase the contents of the chip and to write new contents into it with electrical signals.