xSIID - Memory layout

[Pilgrimsmaster]

I cant help directly, but hoping tgere is something in the links below that can

So what happened with the 2k memory on the xSIID?

TL;DR - The first batch of xSIID made December 2019 were formatted to try to use all 2k of memory across two 1k memory sectors for NFC applications, but the NFC stacks built into Android and iOS phones don’t know how to properly read multiple memory sectors in NFC Type 2 chips. Future batches are formatted to only use the first memory sector which is 1k for NFC applications. The remaining 1k is still readable and writable by phones, but only with a custom smartphone app that can directly address…

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Spark 2 vs xNT vs xSIID

There has been some confusion with regard to the features and benefits of the Spark 2, and other more traditional NFC chips like the NExT, xNT, or xSIID. This post will attempt to explain some of the differences. Specifications [image] The Spark 2 (NTAG413/424) The Spark 2 has an NTAG413/424 chip inside and is a cryptographically authenticatable RFID transponder, meant to be used primarily with the VivoKey service platform for secure identity applications and service offerings. Because it …