Drunk monk when running gdiskdump. Work with zipped images only. To copy from your computer to your card. Select inputfile not disk drive get name of file .gz selected from your computer in gdiskdump select ---Forward select output now select disk drive--- Forward make sure to select your card in your card reader. Go it will take some time to copy to the card.
To make a back up just --- reverse--- input --your card as a drive to ---output ---your computer as a file named what you want will be a .gz
MANY THANKS to Pcampbell for the tip.