SD cards, particular of the earlier models like those 2G Class 2/4 etc a few years back, are not fool proof and they were well known for limited life span (despite so, I still use some Toshiba No Class 256M/512M card for gear testing). I once bought a Kingmax (Taiwanese brand) 2G Class 4 waterproof SD card (I tried one 512M before and was very good). Although it was relatively high speed at that time, in reality it was slower than a snail in a not demanding FZ30. After a few uses, it was full of errors. It is why I would always stick to smaller cards like max 8G in the past and now 16G. I won't mind to change cards twice or more a day since if error happened, partial of my work would still be safe.
Kingmax Unveils 16GB Waterproof SD Card
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