hey.. i first just tried to empty the trash bin.. for some reason the data just didnt want to disappear after deleting it so i went to the application for the different devices(sry, dont know the word in english) and started to parttition the card.. it didnt work with the mac system.. it workesd a bit with the ms dos system (card is recognized by camera.. memory is empty)but after each taken picture the camera shuts down by itself and the picture is not on the camera anymore..its a pentax optio m30.. how di i make the card work again? thank you. drummonds