I posted a topic a week or two ago, though it was the Canon utilities giving me a hard time, but I found otherwise. I purchased this card new from Costco about a month ago........ .......and have had nothing but troubles with it. I took 300 pics the other night during a high school football game, and I get home to find about 75 of them are corrupt files. To top that off, I can't get this mofo to read worth a shit. I have to take it out/put it back in my card reader, open and close the utility a few times...........etc.........finally it will work. Sometimes I will get all of the pics off in one shot, sometimes it takes 3 or more times to get all the pics off. So...........anyone had this happen? Corrupt card? I am sure Costco would give me an exchange. If others have had the same problem with this card, I am going to swap for another Lexar. My 512MB Lexar backup is how I know its a card problem.......it works like a champ. My Lexar 1GB card worked flawlessly every time also. Anyone?