Thanks for the replies, much appreciated. But I already understand the whole "class = write speed" thing. Just wanted to know which particular one they were using as it appears whichever one it is seems not to be as prone to the same failures as some other cards (so far). I wanted to make sure and get the same exact model since noone seems to know exactly which variable (i.e. write speed, capacity, memory type, etc...) is causing this behavior. Just trying to be "better safe than sorry", I suppose.