I bought two of these cards in front of our summer vacation. The first card worked well at first in our HD video camera to the media about half was full. Then the camera suddenly showed that the card is defective. Back home, I could still save the data with an appropriate recovery program and the card could be reformat. Christmas dinner now with the second card of SUPERGAU: added the mess the children and then the error message: CHECK CARD! No Rescue program displays the disk at all on, data recovery seemingly impossible - I hope the people of Amazon can help.