Charles, if you Google "fake SandDisk card" or something like this - you will come by the eBay guide to the fake memory cards. There is a fair chance that your card (especially when you say - different style of card - they should all be the same across all the batches of the same model) is not exactly made by Sandisk.
I had this very problem when I had to move from CF for my *istD to SD for my K10D. I have now (original) SandDisk UltraII plus card (one that can also be used as a stand alone disk on key - it has USB port built in) and it works fine with my K10D. As a matter of habit I don't have the preview option turned on on my camera. I usually chimp at will. And as it has been suggested, I format my cards only in the camera. Another thing that became apparent is that my card reader had flaky SD port. After I replaced it with the cheapest possible SanDisk MicroMate (and it is a good thing it is small - easily taken with me if necessary), another bunch of my card problems went away. HTH. Boris -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
