Originally Posted by philmorley
on my k20d I have tried 3 memory cards,
1 of them will give me this BUT
only about 1/2-1/3rd of images
no particular order (so not every 2nd one etc)
and only when shooting raw (jpegs are fine)
and only when I open the image in adobe ps or lightroom (and updating to camera raw 4.5 didn't change it) - I can convert fine in other software such as idimager.
As far as I know, idimager does not have any RAW conversion facility at all - it simply displays the JPEG preview that is embedded within the RAW file by the camera. If you can find an actul RAW converted (eg, Pentax Photo Laboratory) that will handle the files OK, then I'd assume there is some sort of bug in ACR triggered by these files. but I'm guess the files really are corrupt, and in such a way that the preview is fine but the RAW data is hosed.
If this happens on only one card, I'd agree it's time to retire that card.