RFID tags have a very limited amount of memory, because more memory increases tag price. Escort Memory Systems offers the Cobalt series of high-frequency (HF) RFID tags with 200 bytes of memory, as well as the HMS series, which has 32 bytes. These are among the few tags with sufficient memory to store, say, a JPEG image.
Most UHF tags have 128 bits of memory, enough to store a unique ID and nothing more. There are UHF tags based on the ISO 18000-6C air interface protocol standard that have 512 bits or 64 kilobits of data.
You can write whatever type of information you want to the user memory, such as a description of a project and variable information, including its condition when last seen. I hope that answers your question.
—Mark Roberti, Editor, RFID Journal
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