My DS had a problem with SanDisk cards too, although they worked in the camera, I was unable to read them in my USB card reader.
I thought the first card was a dud so I got it replaced, same problem with the new one, however. Changed to a Kingston card that worked fine. Regards, Bertil -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.