First time this has ever happened to me:
I was taking the last few shots on a card, expecting to see the "Card Full" message after the next two exposures, but instead I got a "Card Error" message. I didn't think much of it at the time, I assumed maybe I had lost just that last picture. I continued on with a spare.
Then this evening I put it in my card reader... nothing, no shots, no images, nothing. Roughly 50 exposures disappeared. The spare was fine.
The only thing I can think of that might be a cause was heat - it was a very hot day, middle of the afternoon, and I was in the direct sun (I know - Mad Dogs and Englishmen).
I use a Minolta DiMage A1, and the card is a 256MB CompactFlash, with the brand name Unity Digital on it.
Anybody have any similar experiences? Advice?