I have a Nikon 5700 about three weeks old. I've already returned one 256 MB
Compact Flash card because it became corrupted. It's very frustrating to
take a whole bunch of pictures and then have them crap out when you go to
upload them to the computer. Formatting did not help (in fact, I had to 
format it via the computer first) as it crapped out again. 

I bought a new card, and also got a replacement for what I thought was the
damaged one. Now one of the new cards is giving me problems. I'm starting 
to wonder if it is the camera that is corrupting the card. 

Has anyone else had this problem? The data will not download, and the
camera shows me a message that the card is unusable. 

Bad manufacturer of cards, maybe?

Herm