It's unfortunate that my little aside about write-once memory cards completely dominated the Comments yesterday. (Didn't see that coming.)
However, I did learn something. First, I learned that some people are already using their cards one-shot. That's a new one on me. Second, as Richard T. and several others pointed out, SanDisk has already been down this road, with its 1GB WORM card (the acronym is for write once, read many). The card is supposedly securely non-rewritable but readable anywhere, and the memory is optimized to last for 100 years.
Curiously, just about exactly what I was envisioning...before I knew it actually existed.
They're evidently not widely available and not well supported, and I couldn't find a list of devices than can write to them, a list which SanDisk implies is limited. I also tried contacting SanDisk, but my attempts bombed. (Curiously, the operator at corporate headquarters couldn't put me in touch with PR...she said she only has a name directory and not a departmental one. I've never encountered that before.)
Strange. I'd think that SanDisk would like nothing better than to encourage people to use memory cards only once and then keep them; it would provide them with a constantly renewing market. But, turns out, they don't even want to talk to anybody about it.
And in an unrelated P.S., I should have pointed out yesterday that I use 16GB SanDisk Extreme Pro CF cards in my Nikon D800.
P.S. I should probably also mention that I'm not necessarily advocating one-shot memory cards and probably wouldn't use them if they were readily available. It really was just an idle question.
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