So I just purchased a new 4gb extreme 3 SDHC card for my Rebel XSI. I always shoot in Raw mode but when i transfer the images from the card onto my new macbook pro the small thumbnail looks good but when I open it whether it be in photoshop CS4, preview or whatever else the image is horribly corrupted. I updated all of my drivers and have never had this problem before. I switched back to my old 1 gb sd card and everything works fine. Is it possible that the card is just bad or is it something i can fix? Any help would be greatly appreciated! below is a sample of the corrupted image i see. Thanks!