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What's the difference between read-only and read-write RFID tags
Jun 12, 2018

What's the difference between read-only and read-write RFID tags


Microchips in RFID tags can be read-only, read-write or “write once, read many” (WORM). 


A read-only tag has a unique factory-assigned serial number for identification that cannot be modified. Read-only microchips have information stored on them during the manufacturing process. The information on such chips can never be changed.


A read-write tag, on the other hand, is field programmable which can be written to at least once. Write-once, read-many (WORM) tags and read-write (RW) tags which can be written to multiple times, are the two types of read-write tags. WORM tags can have a serial number written to them once, and that information cannot be overwritten later. However, with read-write chips, you can add information to the tag or write over existing information when the tag is within range of a reader. Read-write tags usually have a serial number that can't be written over. Additional blocks of data can be used to store additional information about the items the tag is attached to (these can usually be locked to prevent overwriting of data). 





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