I have an e755 and just bought a Lexar SD 256mb from Sam's Club. I was originally using a 64mb SD Card with no problems. I took out my old 64mb card and copied it's contents to my C: Drive through a card reader. I then copied those contents to the new 256mb card and put the new card into the e755 and it was able to read it but not write to it. Am I doing something wrong? Or is it just a bad card or do I need to use a different brand card?