I bought Pentax K20D and 4GB SDHC memory card. After taking 2-3 photos I experienced a problem with card. It shows "Camera cannot display this image". I formatted this card wth camera Format function and SD stopped function at all. Then I formatted it on my old Canon PowerShot G9 camera and interted to Pentax. It started functioning. But when I captured RAW format images, the problem returned again. Is it a memory card problem or Pentax camera problem. Did anybody experienced the same problem?