I need some help to determine if I can save any of the images I took today with a 512MB Lexar card. The camera suddenly did not write to the card any longer (although just seconds earlier I looked at some of the shots) and the showed where the remaining images are displayed. The card was probably 3/4 filled with NEFs when it displayed 'This card cannot be used'. It's not recognized by the D50 or as a disk image by my Powerbook. Cannot be formatted either. Cannot be read in another camera either. So, I'm at a loss here and wonder if I can retrieve my shots somehow.