I too am returning this card. From the other reviews I've read, the card seems not like the Nikon D300. And also being used in different camera bodies.

I'm going for the Kingston warranty since I have had it for while. What a pain. Now after having read the warranty again, I have to get a RMA.Get more detail about Kingston Elite Pro 16 GB 133x CompactFlash Memory Card CF/16GB-S2.