I suspect it is not using flash RAM technology. Note that a SD-Worm compatible device is required to write to the card, although any SD device can read it. That may be due to a higher required write current, and the memory cells may be more akin to fusible links.
It may have more in common with old PROMs or UV-erasable EPROMs, both of which existed well before flash RAM.
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@MayaPosch
I suspect it is not using flash RAM technology. Note that a SD-Worm compatible device is required to write to the card, although any SD device can read it. That may be due to a higher required write current, and the memory cells may be more akin to fusible links.
It may have more in common with old PROMs or UV-erasable EPROMs, both of which existed well before flash RAM.