I'd be wary of this unless you're planning on multiple levels of redundancy. Those old cards (at least the ones I've collected from phones over the years) are just so poor that you can't rely on them for much.
WORM is a slightly less scary, but I still wouldn't trust them without being able to handle failure of 50% of the cards.
WORM is a slightly less scary, but I still wouldn't trust them without being able to handle failure of 50% of the cards.